Merge branch '478230-cleanup' into 'master'

Cleanup write_to_ci_build_tags feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/163587



Merged-by: Tianwen Chen <tchen@gitlab.com>
Approved-by: Max Orefice <morefice@gitlab.com>
Approved-by: Tianwen Chen <tchen@gitlab.com>
Co-authored-by: Marius Bobin <mbobin@gitlab.com>