Validate and document the complete process of installing a dynamic plugin in an airgapped deployment for both Operator and Helm methods on Kubernetes/OpenShift cluster. Ref: https://docs.redhat.com/en/documentation/red_hat_developer_hub/1.7/html/installing_and_viewing_plugins_in_red_hat_developer_hub/rhdh-installing-rhdh-plugins_title-plugins-rhdh-about#proc-install-plugins-using-custom-npm-registry 

Test 1: Operator Method
[ ] Create .npmrc Secret with internal registry config
[ ] Configure Backstage CR with extraFiles
[ ] Deploy and verify plugin installation from internal registry
[ ] Document exact YAML used and verification steps
[ ] Capture any errors/gotchas encountered

Test 2: Helm Method
[ ] Create .npmrc Secret with naming convention
[ ] Deploy Helm chart
[ ] Verify automatic Secret mounting
[ ] Document exact commands and YAML used
[ ] Capture any errors/gotchas encountered