Add http status cop to all group controller specs

.rubocop.yml

ee/spec/controllers/groups/audit_events_controller_spec.rb

...ontrollers/groups/autocomplete_sources_controller_spec.rb

ee/spec/controllers/groups/billings_controller_spec.rb

ee/spec/controllers/groups/boards_controller_spec.rb

ee/spec/controllers/groups/clusters_controller_spec.rb

...trollers/groups/contribution_analytics_controller_spec.rb

.../controllers/groups/dependency_proxies_controller_spec.rb

...groups/dependency_proxy_for_containers_controller_spec.rb

ee/spec/controllers/groups/epic_issues_controller_spec.rb

ee/spec/controllers/groups/epic_links_controller_spec.rb

ee/spec/controllers/groups/epics/notes_controller_spec.rb

ee/spec/controllers/groups/epics_controller_spec.rb

ee/spec/controllers/groups/group_members_controller_spec.rb

ee/spec/controllers/groups/groups_controller_spec.rb

ee/spec/controllers/groups/hooks_controller_spec.rb

ee/spec/controllers/groups/insights_controller_spec.rb

...ec/controllers/groups/issues_analytics_controller_spec.rb

ee/spec/controllers/groups/issues_controller_spec.rb

ee/spec/controllers/groups/merge_requests_controller_spec.rb