[Data Discovery] Unskip tests skipped in #175740 (#178592)

## Summary

This PR fixes and unskips the Data Discovery tests skipped in #176882.

Flaky test runner x50:
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/5594.

Partially resolves #176882.

### Checklist

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [ ] Any UI touched in this PR is usable by keyboard only (learn more
about [keyboard accessibility](https://webaim.org/techniques/keyboard/))
- [ ] Any UI touched in this PR does not create any new axe failures
(run axe in browser:
[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),
[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [ ] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)

### For maintainers

- [ ] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: Matthias Wilhelm <matthias.wilhelm@elastic.co>

test/functional/apps/discover/group1/_discover.ts

@@ -31,8 +31,7 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
     defaultIndex: 'logstash-*',
   };
 
-  // Failing: See https://github.com/elastic/kibana/issues/176882
-  describe.skip('discover test', function describeIndexTests() {
+  describe('discover test', function describeIndexTests() {
     before(async function () {
       log.debug('load kibana index with default index pattern');
       await kibanaServer.importExport.load('test/functional/fixtures/kbn_archiver/discover');

test/functional/apps/discover/group1/_url_state.ts

@@ -35,8 +35,7 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
     hideAnnouncements: true,
   };
 
-  // Failing: See https://github.com/elastic/kibana/issues/176882
-  describe.skip('discover URL state', () => {
+  describe('discover URL state', () => {
     before(async function () {
       log.debug('load kibana index with default index pattern');
       await kibanaServer.importExport.load('test/functional/fixtures/kbn_archiver/discover');

x-pack/test_serverless/functional/test_suites/common/discover/group1/_discover.ts

@@ -31,8 +31,7 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
     defaultIndex: 'logstash-*',
   };
 
-  // Failing: See https://github.com/elastic/kibana/issues/176882
-  describe.skip('discover test', function describeIndexTests() {
+  describe('discover test', function describeIndexTests() {
     before(async function () {
       log.debug('load kibana index with default index pattern');
       await kibanaServer.importExport.load('test/functional/fixtures/kbn_archiver/discover');

x-pack/test_serverless/functional/test_suites/common/discover/group1/_discover_histogram.ts

@@ -32,8 +32,7 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
   const log = getService('log');
   const queryBar = getService('queryBar');
 
-  // Failing: See https://github.com/elastic/kibana/issues/176882
-  describe.skip('discover histogram', function describeIndexTests() {
+  describe('discover histogram', function describeIndexTests() {
     before(async () => {
       await esArchiver.loadIfNeeded('test/functional/fixtures/es_archiver/logstash_functional');
       await esArchiver.load('test/functional/fixtures/es_archiver/long_window_logstash');
@@ -86,7 +85,7 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
 
       await PageObjects.discover.brushHistogram();
       await PageObjects.discover.waitUntilSearchingHasFinished();
-      renderingCountInc = 3; // Multiple renders caused by https://github.com/elastic/kibana/issues/177055
+      renderingCountInc = 4; // Multiple renders caused by https://github.com/elastic/kibana/issues/177055
       await retry.waitFor('chart rendering complete after being brushed', async () => {
         const actualCount = await elasticChart.getVisualizationRenderingCount();
         const expectedCount = prevRenderingCount + renderingCountInc * 2;

x-pack/test_serverless/functional/test_suites/common/discover_ml_uptime/discover/index.ts

@@ -6,8 +6,14 @@
  */
 import { FtrProviderContext } from '../../../../ftr_provider_context';
 
-export default ({ loadTestFile }: FtrProviderContext) => {
+export default ({ getService, loadTestFile }: FtrProviderContext) => {
+  const browser = getService('browser');
+
   describe('Discover alerting', function () {
+    before(async function () {
+      await browser.setWindowSize(1600, 1200);
+    });
+
     loadTestFile(require.resolve('./search_source_alert'));
   });
 };

x-pack/test_serverless/functional/test_suites/common/discover_ml_uptime/discover/search_source_alert.ts

@@ -341,8 +341,7 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
     expect(await titleElem.getAttribute('value')).to.equal(dataView);
   };
 
-  // Failing: See https://github.com/elastic/kibana/issues/176882
-  describe.skip('Search source Alert', () => {
+  describe('Search source Alert', () => {
     before(async () => {
       await security.testUser.setRoles(['discover_alert']);
       await PageObjects.svlCommonPage.loginAsAdmin();