Merge branch 'revert-65630b30' into 'master'

Revert "Add generate_ci_finished_builds_sync_events feature flag"

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138194



Merged-by: Vladimir Shushlin <vshushlin@gitlab.com>
Approved-by: Vladimir Shushlin <vshushlin@gitlab.com>
Co-authored-by: Pedro Pombeiro <noreply@pedro.pombei.ro>