Add "Additional membership" field to member drawer
## Proposal ![Admin_View_-_Direct](/uploads/429bd34a6b969e230cc8cb8e7fd185f2/Admin_View_-_Direct.png) ![Group_37](/uploads/6abffada27d5b75066334e302a590ab1/Group_37.png) - Add `Additional membership` field to drawer that lists out all the sources of membership. For example this could be: - Direct member by John Smith - Inherited from Foo bar - Invited group Baz - Change `Source` column to `Membership source` ## Implementation guide ### Frontend - In `app/assets/javascripts/members/components/table/drawer/role_details_drawer.vue` add an `Additional membership` section that loops through `member.sources` and lists them out. - Change `Source` column name to `Membership source` in `app/assets/javascripts/members/constants.js` ### Backend https://gitlab.com/gitlab-org/gitlab/-/issues/504948
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