Remove the issue_discussions_http_cache flag
What does this MR do and why?
This removes the issue_discussions_http_cache feature flag. This allows us to avoid JSON serialization when the ETag matches.
This is working as expected and has been tested on GitLab.com for 3 weeks already.
Related to #343309 (closed)
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Heinrich Lee Yu