Make role dropdown on group admin area consistent
This is the same as https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14049.
What does this MR do?
Change the group role dropdown on group admin area to new style.
Screenshots
Before | After |
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What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ce/issues/28921, https://gitlab.com/gitlab-org/gitlab-ce/issues/35424