Remove reset_approvals_patch_id feature flag
What does this MR do and why?
The feature flag was rolled out on production for around a week now and no issues were found/reported related to it.
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 #426874 (closed)