Merge branch '408288-merged-merge-request-delete-event-started' into 'master'

Audit event for merge request merged deletion started

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/121594



Merged-by: Jessie Young <jessieyoung@gitlab.com>
Approved-by: Hitesh Raghuvanshi <hraghuvanshi@gitlab.com>
Approved-by: Jessie Young <jessieyoung@gitlab.com>
Reviewed-by: Hitesh Raghuvanshi <hraghuvanshi@gitlab.com>
Reviewed-by: Jessie Young <jessieyoung@gitlab.com>
Co-authored-by: Hitesh Raghuvanshi <hraghuvanshi@gitlab.com>
Co-authored-by: harsimarsandhu <hsandhu@gitlab.com>