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>

packages/kbn-search-connectors/connectors.ts

@@ -43,6 +43,17 @@ export const CONNECTOR_DEFINITIONS: ConnectorServerSideDefinition[] = [
     }),
     serviceType: 'confluence',
   },
+  {
+    iconPath: 'confluence_cloud.svg',
+    isBeta: false,
+    isNative: true,
+    isTechPreview: true,
+    keywords: ['confluence', 'data', 'center', 'connector'],
+    name: i18n.translate('searchConnectors.content.nativeConnectors.confluence_data_center.name', {
+      defaultMessage: 'Confluence Data Center',
+    }),
+    serviceType: 'confluence',
+  },
   {
     iconPath: 'dropbox.svg',
     isBeta: false,
@@ -64,6 +75,17 @@ export const CONNECTOR_DEFINITIONS: ConnectorServerSideDefinition[] = [
     }),
     serviceType: 'jira',
   },
+  {
+    iconPath: 'jira_cloud.svg',
+    isBeta: false,
+    isTechPreview: true,
+    isNative: true,
+    keywords: ['jira', 'data', 'center', 'connector'],
+    name: i18n.translate('searchConnectors.content.nativeConnectors.jira_data_center.name', {
+      defaultMessage: 'Jira Data Center',
+    }),
+    serviceType: 'jira',
+  },
   {
     iconPath: 'github.svg',
     isBeta: false,

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(

x-pack/plugins/enterprise_search/server/integrations.ts

@@ -817,6 +817,34 @@ export const registerEnterpriseSearchIntegrations = (
       shipper: 'enterprise_search',
       isBeta: false,
     });
+    customIntegrations.registerCustomIntegration({
+      id: 'confluence_data_center',
+      title: i18n.translate(
+        'xpack.enterpriseSearch.integrations.connectors.confluenceDataCenterTitle',
+        {
+          defaultMessage: 'Confluence Data Center',
+        }
+      ),
+      description: i18n.translate(
+        'xpack.enterpriseSearch.integrations.connectors.confluenceDataCenterDescription',
+        {
+          defaultMessage: 'Search over your content on Confluence Data Center.',
+        }
+      ),
+      categories: ['enterprise_search', 'elastic_stack', 'custom', 'connector', 'connector_client'],
+      uiInternalPath:
+        '/app/enterprise_search/content/search_indices/new_index/connector?service_type=confluence',
+      icons: [
+        {
+          type: 'svg',
+          src: http.basePath.prepend(
+            '/plugins/enterpriseSearch/assets/source_icons/confluence_cloud.svg'
+          ),
+        },
+      ],
+      shipper: 'enterprise_search',
+      isBeta: false,
+    });
     customIntegrations.registerCustomIntegration({
       id: 'jira_cloud',
       title: i18n.translate('xpack.enterpriseSearch.integrations.connectors.jiraCloudTitle', {
@@ -850,6 +878,41 @@ export const registerEnterpriseSearchIntegrations = (
       shipper: 'enterprise_search',
       isBeta: false,
     });
+    customIntegrations.registerCustomIntegration({
+      id: 'jira_data_center',
+      title: i18n.translate(
+        'xpack.enterpriseSearch.integrations.connectors.jiraDataCenterCloudTitle',
+        {
+          defaultMessage: 'Jira Data Center',
+        }
+      ),
+      description: i18n.translate(
+        'xpack.enterpriseSearch.integrations.connectors.jiraDataCenterDescription',
+        {
+          defaultMessage: 'Search over your content on Jira Data Center.',
+        }
+      ),
+      categories: [
+        'enterprise_search',
+        'elastic_stack',
+        'custom',
+        'connector',
+        'connector_client',
+        ...nativeSearchTag,
+      ],
+      uiInternalPath:
+        '/app/enterprise_search/content/search_indices/new_index/connector?service_type=jira',
+      icons: [
+        {
+          type: 'svg',
+          src: http.basePath.prepend(
+            '/plugins/enterpriseSearch/assets/source_icons/jira_cloud.svg'
+          ),
+        },
+      ],
+      shipper: 'enterprise_search',
+      isBeta: false,
+    });
 
     customIntegrations.registerCustomIntegration({
       id: 'jira_server',