Merge branch 'colors-and-labels-for-housekeeper' into 'master'

Add standard description/labels to MRs and purple color titles

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142129



Merged-by: Rémy Coutable <remy@rymai.me>
Approved-by: Rémy Coutable <remy@rymai.me>
Reviewed-by: Rémy Coutable <remy@rymai.me>
Co-authored-by: Dylan Griffith <dyl.griffith@gmail.com>