Revert '246905-only-allow-multiple-reviewers-in-paid-tiers' [RUN AS-IF-FOSS]

What does this MR do?

Reverts !43256 (merged) to close #259253 (closed)

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