Enable merge requests discussions cache
What does this MR do and why?
This removes the merge_request_discussions_cache feature flag.
The feature flag has been enabled on production for a couple of months now and performance improvements were seen and bugs were fixed.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #335799 (closed)
Edited by Patrick Bajao