Merge branch '14380-scheduled-merge/controllers-and-frontend' into 'master'

Add frontend and controllers for scheduled merge

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/165250



Merged-by: Vitaly Slobodin <vslobodin@gitlab.com>
Approved-by: Thomas Randolph <trandolph@gitlab.com>
Approved-by: Michael Le <mle@gitlab.com>
Approved-by: Amy Qualls <aqualls@gitlab.com>
Approved-by: Vasilii Iakliushin <viakliushin@gitlab.com>
Approved-by: Vitaly Slobodin <vslobodin@gitlab.com>
Reviewed-by: Vasilii Iakliushin <viakliushin@gitlab.com>
Reviewed-by: Vitaly Slobodin <vslobodin@gitlab.com>
Reviewed-by: Michael Le <mle@gitlab.com>
Reviewed-by: Amy Qualls <aqualls@gitlab.com>
Reviewed-by: Niklas van Schrick <mc.taucher2003@gmail.com>
Co-authored-by: Niklas <mc.taucher2003@gmail.com>