Add tiles and integrations for Jira Data Center and Confluence Data Center (#177436)

## Summary

This PR adds tiles for two connectors:

- Jira Data Center
- Confluence Data Center

These connectors internally use same service types: `jira` and
`confluence`. They re-use documentation for these connectors - it can be
found in the same pages as for original Jira/Confluence connectors.

The tiles are added to Enterprise Search connectors page + into
integrations page. See screenshots.

<img width="1217" alt="Screenshot 2024-02-21 at 14 10 20"
src="da944de9-828b-453b-ad38-1695ae3d557a">

<img width="1217" alt="Screenshot 2024-02-21 at 14 11 09"
src="aaac975e-e423-42a3-846b-628e9e673b5a">


### Checklist

Delete any items that are not applicable to this PR.

- [x] 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)
- [x]
[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\

### 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: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

test/api_integration/apis/custom_integration/integrations.ts

@@ -22,7 +22,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.body).to.be.an('array');
 
-        expect(resp.body.length).to.be(54);
+        expect(resp.body.length).to.be(56);
 
         // Test for sample data card
         expect(resp.body.findIndex((c: { id: string }) => c.id === 'sample_data_all')).to.be.above(