Remove paginated_notes feature flag
What does this MR do and why?
Reverts most of 2066f29a
We decided to move forward with paginated_discussions so this is no longer needed.
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 #254987 (closed)
Edited by Heinrich Lee Yu