Merge branch '338908-enable-ci_create_external_pr_pipeline_async' into 'master'

Enable FF ci_create_external_pr_pipeline_async by default

See merge request gitlab-org/gitlab!70681

config/feature_flags/development/ci_create_external_pr_pipeline_async.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/338908
 milestone: '14.3'
 type: development
 group: group::pipeline authoring
-default_enabled: false
+default_enabled: true