Remove dropdown to add members from admin area

Peter Hegmanrequested to merge
369988-replace-user_select-in-app-assets-javascripts-pages-admin-groups-show-index-js into master

What does this MR do and why?

Related to #369988 (closed)

There is currently a legacy dropdown in /admin/groups/gitlab-org that allows you to add members to a group. We decided in #369988 (comment 1109618707) that it made more sense to remove this dropdown and instead have users manage members in the members page which we link to right below with the Manage access button.

Screenshots or screen recordings

Before After
Screen_Shot_2022-09-29_at_12.51.54_PM Screen_Shot_2022-09-29_at_12.42.19_PM

How to set up and validate locally

Sign in as an Admin and navigate to /admin/groups/gitlab-org

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Peter Hegman

Merge request reports