gcp_cli_oauth: added clarity for environment tag feedback

Author: lorcanrae

_partials/gcp_cli_oauth.md

@@ -39,6 +39,8 @@ gcloud config set project <YOUR_PROJECT_ID>
 # gcloud config set project my-gcp-project
 ```
 
+💡 If you get a terminal message saying your project: _lacks an environment tag_ - you can safely ignore it
+
 Confirm your setup with:
 
 ```bash