Uninstall cluster applications (backend services)

What does this MR do?

Closes #60665 (closed)

Right now this is based on https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27348 so we will want to rebase after that is merged.

• Define state transitions for uninstalling apps
• DeleteCommand and ResetCommand
• Add service to uninstall application and check progress of uninstallation
• Delete application after uninstalled
• Add endpoint to uninstall application
• Mark all applications as not uninstallable
• expose cluster_status.json
• Make 1 application (prometheus) as can_uninstall? => true

Manual QA

✅ Un-install prometheus by triggering app.make_scheduled! && Clusters::Applications::UninstallService.new(app).execute manually

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team