Enable MR discussions HTTP caching by default
What does this MR do and why?
The mr_discussions_http_cache
feature flag was enabled on production for a couple of days now and no issues were reported.
This MR keeps the new code path to enable ETag caching for MR discussions.json endpoint.
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 #368363 (closed)
Edited by Patrick Bajao