Merge branch '513352-assign-milestone-epic-quick-action' into 'master'

Milestone quick actions integration on Epic work items

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183092



Merged-by: Nicolas Dular <ndular@gitlab.com>
Approved-by: Nicolas Dular <ndular@gitlab.com>
Reviewed-by: Kassio Borges <kborges@gitlab.com>
Co-authored-by: Nasser Zahrani <nzahrani@gitlab.com>