Merge branch '423981-fe-display-hierarchy-widget-for-work-items-with-type-epic' into 'master'

Display hierarchy widget on Epic work items

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/140044



Merged-by: Florie Guibert <fguibert@gitlab.com>
Approved-by: Rajan Mistry <rmistry@gitlab.com>
Approved-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Reviewed-by: Florie Guibert <fguibert@gitlab.com>
Reviewed-by: Rajan Mistry <rmistry@gitlab.com>