Enable cluster_management_project FF by default

What does this MR do?

Enable cluster_management_project FF by default

This has been verified on GitLab.com now. But keeping the ability to disable just in case.

Related issue: #32810 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability 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