Maven Virtual Registry: feature flag cleanup

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🔭 Issues plan

1. Maven Virtual Registry: Database models (#467972 - closed).
2. Maven Virtual Registry: Permissions policy (#467977 - closed).
3. Maven Virtual Registry: Registry models API (#467979 - closed).
4. Maven Virtual Registry: Maven API endpoint (#467982 - closed).
5. Maven Virtual Registry: Cache logic (#467983 - closed).
6. Maven Registry: Cached responses destruction (#468113 - closed).
7. Improve workhorse dependencyproxy logic (#461561 - closed).
8. Maven Virtual Registry: Documentation (#468115 - closed).
9. Maven Virtual Registry: Performance review (#468116 - closed).
10. Maven Virtual Registry: feature flag cleanup (#468117). 👈 You're here.

🗒️ Description

• Remove the feature flag from the implementation.
• Remove the feature flag from the documentation.
• Move to GA.