Identifying all cross joins between namespaces and users

.rubocop_todo/layout/line_length.yml

app/finders/events_finder.rb

app/finders/issuables/assignee_filter.rb

app/finders/members_finder.rb

app/finders/merge_requests_finder.rb

app/models/concerns/milestoneish.rb

app/models/concerns/protected_ref.rb

app/models/concerns/protected_ref_access.rb

app/models/group.rb

app/models/member.rb

app/services/boards/base_items_list_service.rb

db/gitlab_schemas/gitlab_main_cell.yaml

ee/app/finders/epics_finder.rb

ee/app/finders/merge_requests/by_approvers_finder.rb

ee/app/finders/namespaces/billed_users_finder.rb

ee/app/finders/namespaces/free_user_cap/users_finder.rb

ee/app/models/approval_merge_request_rule.rb

ee/app/models/approval_state.rb

ee/app/models/approval_wrapped_rule.rb

ee/app/models/concerns/approval_rule_like.rb