Merge branch 'consolidate-job-behavior-variables' into 'master'

Consolidate some CI variables that can change jobs behavior

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/141601



Merged-by: David Dieulivol <ddieulivol@gitlab.com>
Approved-by: David Dieulivol <ddieulivol@gitlab.com>
Reviewed-by: Rémy Coutable <remy@rymai.me>
Co-authored-by: Rémy Coutable <remy@rymai.me>