Show Usage Quotas regardless of namespace subscription

What does this MR do?

Promote usage_quotas to a global feature, it will allow selling additional CI minutes regardless of namespace subscription.

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

Closes #12142 (closed)