Remove commit_message_logger feature flag

Vasilii Iakliushinrequested to merge
523395-remove-ff into master

What does this MR do and why?

Contributes to #523395 (closed)

This feature flag was supporting the transition from DB to Gitaly to access commit data. It's not needed anymore.

References

[Feature flag] Rollout of `commit_message_logger` (#523395 - closed)

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Related to #523395 (closed)

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