Merge branch 'jc/work-item-epic-list-1' into 'master'

Make Epics List work item based

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/159604



Merged-by: Coung Ngo <cngo@gitlab.com>
Approved-by: Abhilash Kotte <akotte@gitlab.com>
Approved-by: Max Woolf <mwoolf@gitlab.com>
Approved-by: Coung Ngo <cngo@gitlab.com>
Reviewed-by: Coung Ngo <cngo@gitlab.com>
Reviewed-by: John McDonnell <jmcdonnell@gitlab.com>
Co-authored-by: Jack Chapman <jachapman@gitlab.com>