Remove mr_attention_requests feature flag
What does this MR do and why?
This MR removes mr_attention_requests feature flag and remaining associated backend codes.
We still need to remove state
column from merge_request_assignees
and remove update_state_by_user_id
from both merge_request_assignees
and merge_request_reviewers
. It will be done in follow up MRs.
Related to #366442 (closed)
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 #366442 (closed)