Merge branch 'remove-not-owned-feature-category' into 'master'

Remove not_owned feature category from feature_categories.yml

See merge request gitlab-org/gitlab!65644

config/feature_categories.yml

@@ -84,7 +84,6 @@
 - mlops
 - mobile_signing_deployment
 - navigation
-- not_owned
 - omnibus_package
 - on_call_schedule_management
 - onboarding