Merge branch...

Merge branch '355996-follow-up-from-bulk-adding-members-needs-to-consider-user-records-as-well-as-the-ids' into 'master'

Create a scope for members by user

See merge request gitlab-org/gitlab!83134

app/services/concerns/members/bulk_create_users.rb

@@ -53,7 +53,7 @@ module Members
 
           if users.present?
             # helps not have to perform another query per user id to see if the member exists later on when fetching
-            existing_members = source.members_and_requesters.where(user_id: users).index_by(&:user_id) # rubocop:disable CodeReuse/ActiveRecord
+            existing_members = source.members_and_requesters.with_user(users).index_by(&:user_id)
           end
 
           [emails, users, existing_members]