Only run osdu_gcp_dags_rsync for the default branch and trusted branches, not all protected refs

Importantly, this doesn't include release branches or tags. Because in those cases, the dependent job build_osdu_gcp_image isn't
built.

.gitlab-ci.yml

@@ -116,8 +116,8 @@ osdu_gcp_dags_rsync:
     - popd
     - gsutil cp devops/osdu-gcp/airflow_configs.yaml "$OSDU_GCP_DEPL_TARGET_V2"/dags/configs/
   only:
-    variables:
-      - $CI_COMMIT_REF_PROTECTED
+    - $CI_DEFAULT_BRANCH
+    - /^trusted-/
   when: manual
 
 osdu_gcp_dags_prod_rsync: