* [Monitoring] Support for unlinked deployments (#28278)
* Unlinked deployment working for beats
* Use better constant
* Show N/A for license
* Rename to Unlinked Cluster
* Use callout to mention unlinked cluster
* PR feedback
* Use fragment
* Speed up the query by using terminate_after
* Handle failures more defensively
* Remove unnecessary msearch
* PR feedback
* PR feedback and a bit of light refactor
* Updated text
* Add api integration tests
* Localize call out
* Update loc pattern
* Fix improper i18n.translate usage
* Revert "Fix improper i18n.translate usage"
This reverts commit 0e2e7608c3.
* Revert "Update loc pattern"
This reverts commit cc99fe8a8a.
* Ensure the unlinked deployment cluster counts as a valid cluster
* Sometimes, you miss the smallest things
* Ensure the unlinked cluster is supported, in that users can click the link and load it
* Update tests
* PR feedback. Simplifying the flag supported code and adding more tests
* Update naming
* Rename to Standalone Cluster
* Remove unnecessary file
* Move logic for setting isSupported to exclusively in flag supported clusters code, update tests
* Fix up the data for these tests
