Merge branch '433175_be_list_pending_members_for_admin' into 'master'

GraphQl Query to list selfManagedUsersQueuedForRolePromotion for admin

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/151379



Merged-by: Prabakaran Murugesan <pmurugesan@gitlab.com>
Approved-by: Kos Palchyk <kpalchyk@gitlab.com>
Approved-by: Siddharth Dungarwal <sdungarwal@gitlab.com>
Approved-by: Prabakaran Murugesan <pmurugesan@gitlab.com>
Reviewed-by: Vijay Hawoldar <vhawoldar@gitlab.com>
Reviewed-by: Terri Chu <tchu@gitlab.com>
Reviewed-by: Kos Palchyk <kpalchyk@gitlab.com>
Reviewed-by: Prabakaran Murugesan <pmurugesan@gitlab.com>
Co-authored-by: Suraj Tripathi <stripathi@gitlab.com>