Merge branch 'andrey-allow-buildx-job-skip' into 'master'

Allow selectively skipping certain stages and skip buildx jobs

See merge request https://gitlab.com/gitlab-org/build/CNG/-/merge_requests/1996



Merged-by: Balasankar 'Balu' C <balasankar@gitlab.com>
Approved-by: Balasankar 'Balu' C <balasankar@gitlab.com>
Co-authored-by: Andrejs Cunskis <acunskis@gitlab.com>