Fix Rails/SaveBang offenses for spec/services/* and spec/sidekiq/* [RUN AS-IF-FOSS]

.rubocop_todo.yml

changelogs/unreleased/mb_rails_save_bang_fix5.yml

...es/auth/container_registry_authentication_service_spec.rb

spec/services/auto_merge/base_service_spec.rb

spec/services/auto_merge_service_spec.rb

spec/services/clusters/update_service_spec.rb

...design_management/generate_image_versions_service_spec.rb

spec/services/discussions/resolve_service_spec.rb

spec/services/draft_notes/destroy_service_spec.rb

spec/services/emails/confirm_service_spec.rb

spec/services/groups/destroy_service_spec.rb

spec/services/groups/import_export/import_service_spec.rb

spec/services/labels/promote_service_spec.rb

spec/services/notes/create_service_spec.rb

spec/services/notification_recipients/build_service_spec.rb

spec/services/notification_service_spec.rb

...rvices/packages/conan/create_package_file_service_spec.rb

spec/services/reset_project_cache_service_spec.rb

...services/resource_events/change_milestone_service_spec.rb

spec/services/system_hooks_service_spec.rb