Merge branch '324351-enable-blob-refactor' into 'master'

Enable :refactor_blob_viewer feature flag by default

See merge request gitlab-org/gitlab!80638

config/feature_flags/development/refactor_blob_viewer.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/324351
 milestone: '13.11'
 type: development
 group: group::source code
-default_enabled: false
+default_enabled: true