[8.x] [Navigation] Add stack monitoring to Elasticsearch sidebar (#210139) (#211139)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Navigation] Add stack monitoring to Elasticsearch sidebar
(#210139)](https://github.com/elastic/kibana/pull/210139)

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

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

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Add stack monitoring to Elasticsearch sidebar (#210139)\n\n##
Summary\r\n\r\nThis PR adds `Stack Monitoring` to the side navigation.
\r\nAddresses:
https://github.com/elastic/kibana-team/issues/1312\r\n\r\n![Screenshot
2025-02-07 at 09
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Add stack monitoring to Elasticsearch sidebar (#210139)\n\n##
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Add stack monitoring to Elasticsearch sidebar (#210139)\n\n##
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https://github.com/elastic/kibana-team/issues/1312\r\n\r\n![Screenshot
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BACKPORT-->

Co-authored-by: Krzysztof Kowalczyk <krzysztof.kowalczyk@elastic.co>

x-pack/solutions/search/plugins/enterprise_search/public/navigation_tree.ts

@@ -364,6 +364,10 @@ export const getNavigationTreeDefinition = ({
                     defaultMessage: 'Stack Management',
                   }),
                 },
+                {
+                  id: 'monitoring',
+                  link: 'monitoring',
+                },
               ],
               icon: 'gear',
               id: 'project_settings_project_nav',

x-pack/test/functional_search/tests/solution_navigation.ts

@@ -308,6 +308,7 @@ export default function searchSolutionNavigation({
         'project_settings_project_nav',
         'ml:modelManagement',
         'stack_management',
+        'monitoring',
       ]);
     });
   });