Audit all changes made to mergerequest-level approvers configuration

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Release notes

Changes made to approvers configs at a merge request level are logged to the project's audit events.

Problem to solve

This was requested by a premium customer over support ticket https://gitlab.zendesk.com/agent/tickets/228895 (internal link). They'd like overrides performed within a merge request to its approvers configuration logged as project-level audit events.

Proposal

Currently the only way to check if a merge request made use of the override ability (when permitted) is by checking its API response: https://docs.gitlab.com/ee/api/merge_request_approvals.html#get-the-approval-state-of-merge-requests and looking for value of approval_rules_overwritten.