Merge branch 'set-create-project-namespaces-ff-enabled-by-default' into 'master'

Rollout FF create_project_namespace_on_project_create enabled by default

See merge request gitlab-org/gitlab!75868

config/feature_flags/development/create_project_namespace_on_project_create.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/344954
 milestone: '14.5'
 type: development
 group: group::workspace
-default_enabled: false
+default_enabled: true