[8.15] [Discover] Increase the comparison field limit to 250 (#188028) (#188146)

# Backport

This will backport the following commits from `main` to `8.15`:
- [[Discover] Increase the comparison field limit to 250
(#188028)](https://github.com/elastic/kibana/pull/188028)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Davis
McPhee","email":"davis.mcphee@elastic.co"},"sourceCommit":{"committedDate":"2024-07-11T18:30:48Z","message":"[Discover]
Increase the comparison field limit to 250 (#188028)\n\n##
Summary\r\n\r\nThis PR increases the Discover comparison field limit to
250:\r\n\r\n![comparison](059eda40-4bca-4a20-b480-e420ac0a422e)\r\n\r\nTested
using `many_fields` dataset: `node
scripts/es_archiver\r\n--kibana-url=http://elastic:changeme@localhost:5601\r\n--es-url=http://elastic:changeme@localhost:9200
load\r\ntest/functional/fixtures/es_archiver/many_fields`.\r\n\r\nResolves
#187191.\r\n\r\n### Checklist\r\n\r\n- [ ] Any text added follows [EUI's
writing\r\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\r\nsentence case text and includes
[i18n\r\nsupport](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)\r\n-
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or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n- [ ] [Flaky
Test\r\nRunner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1)
was\r\nused on any tests changed\r\n- [ ] Any UI touched in this PR is
usable by keyboard only (learn more\r\nabout [keyboard
accessibility](https://webaim.org/techniques/keyboard/))\r\n- [ ] Any UI
touched in this PR does not create any new axe failures\r\n(run axe in
browser:\r\n[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),\r\n[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))\r\n-
[ ] If a plugin configuration key changed, check if it needs to
be\r\nallowlisted in the cloud and added to the
[docker\r\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\r\n-
[ ] This renders correctly on smaller devices using a
responsive\r\nlayout. (You can test this [in
your\r\nbrowser](https://www.browserstack.com/guide/responsive-testing-on-local-server))\r\n-
[ ] This was checked for
[cross-browser\r\ncompatibility](https://www.elastic.co/support/matrix#matrix_browsers)\r\n\r\n###
For maintainers\r\n\r\n- [ ] This was checked for breaking API changes
and was
[labeled\r\nappropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)","sha":"4dd31674d12c9cb2962e044248ebd8013c326f2e","branchLabelMapping":{"^v8.16.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","backport:prev-minor","v8.16.0"],"title":"[Discover]
Increase the comparison field limit to
250","number":188028,"url":"https://github.com/elastic/kibana/pull/188028","mergeCommit":{"message":"[Discover]
Increase the comparison field limit to 250 (#188028)\n\n##
Summary\r\n\r\nThis PR increases the Discover comparison field limit to
250:\r\n\r\n![comparison](059eda40-4bca-4a20-b480-e420ac0a422e)\r\n\r\nTested
using `many_fields` dataset: `node
scripts/es_archiver\r\n--kibana-url=http://elastic:changeme@localhost:5601\r\n--es-url=http://elastic:changeme@localhost:9200
load\r\ntest/functional/fixtures/es_archiver/many_fields`.\r\n\r\nResolves
#187191.\r\n\r\n### Checklist\r\n\r\n- [ ] Any text added follows [EUI's
writing\r\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\r\nsentence case text and includes
[i18n\r\nsupport](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)\r\n-
[
]\r\n[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)\r\nwas
added for features that require explanation or tutorials\r\n- [ ] [Unit
or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n- [ ] [Flaky
Test\r\nRunner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1)
was\r\nused on any tests changed\r\n- [ ] Any UI touched in this PR is
usable by keyboard only (learn more\r\nabout [keyboard
accessibility](https://webaim.org/techniques/keyboard/))\r\n- [ ] Any UI
touched in this PR does not create any new axe failures\r\n(run axe in
browser:\r\n[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),\r\n[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))\r\n-
[ ] If a plugin configuration key changed, check if it needs to
be\r\nallowlisted in the cloud and added to the
[docker\r\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\r\n-
[ ] This renders correctly on smaller devices using a
responsive\r\nlayout. (You can test this [in
your\r\nbrowser](https://www.browserstack.com/guide/responsive-testing-on-local-server))\r\n-
[ ] This was checked for
[cross-browser\r\ncompatibility](https://www.elastic.co/support/matrix#matrix_browsers)\r\n\r\n###
For maintainers\r\n\r\n- [ ] This was checked for breaking API changes
and was
[labeled\r\nappropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)","sha":"4dd31674d12c9cb2962e044248ebd8013c326f2e"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v8.16.0","branchLabelMappingKey":"^v8.16.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/188028","number":188028,"mergeCommit":{"message":"[Discover]
Increase the comparison field limit to 250 (#188028)\n\n##
Summary\r\n\r\nThis PR increases the Discover comparison field limit to
250:\r\n\r\n![comparison](059eda40-4bca-4a20-b480-e420ac0a422e)\r\n\r\nTested
using `many_fields` dataset: `node
scripts/es_archiver\r\n--kibana-url=http://elastic:changeme@localhost:5601\r\n--es-url=http://elastic:changeme@localhost:9200
load\r\ntest/functional/fixtures/es_archiver/many_fields`.\r\n\r\nResolves
#187191.\r\n\r\n### Checklist\r\n\r\n- [ ] Any text added follows [EUI's
writing\r\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\r\nsentence case text and includes
[i18n\r\nsupport](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)\r\n-
[
]\r\n[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)\r\nwas
added for features that require explanation or tutorials\r\n- [ ] [Unit
or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n- [ ] [Flaky
Test\r\nRunner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1)
was\r\nused on any tests changed\r\n- [ ] Any UI touched in this PR is
usable by keyboard only (learn more\r\nabout [keyboard
accessibility](https://webaim.org/techniques/keyboard/))\r\n- [ ] Any UI
touched in this PR does not create any new axe failures\r\n(run axe in
browser:\r\n[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),\r\n[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))\r\n-
[ ] If a plugin configuration key changed, check if it needs to
be\r\nallowlisted in the cloud and added to the
[docker\r\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\r\n-
[ ] This renders correctly on smaller devices using a
responsive\r\nlayout. (You can test this [in
your\r\nbrowser](https://www.browserstack.com/guide/responsive-testing-on-local-server))\r\n-
[ ] This was checked for
[cross-browser\r\ncompatibility](https://www.elastic.co/support/matrix#matrix_browsers)\r\n\r\n###
For maintainers\r\n\r\n- [ ] This was checked for breaking API changes
and was
[labeled\r\nappropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)","sha":"4dd31674d12c9cb2962e044248ebd8013c326f2e"}}]}]
BACKPORT-->

Co-authored-by: Davis McPhee <davis.mcphee@elastic.co>

packages/kbn-unified-data-table/src/components/compare_documents/hooks/use_comparison_fields.ts

@@ -12,7 +12,7 @@ import { AdditionalFieldGroups, convertFieldsToFallbackFields } from '@kbn/unifi
 import { isEqual } from 'lodash';
 import { useMemo } from 'react';
 
-export const MAX_COMPARISON_FIELDS = 100;
+export const MAX_COMPARISON_FIELDS = 250;
 
 export interface UseComparisonFieldsProps {
   dataView: DataView;