♻️(yprovider) support multiple API keys to separate responsibilities

Support for two API keys has been added to the YProvider microservice to
decouple responsibilities between the collaboration server and other
endpoints. This improves security by scoping keys to specific purposes and
ensures a clearer separation of concerns for easier management and debugging.

src/helm/env.d/dev/values.impress.yaml.gotmpl

@@ -105,6 +105,7 @@ yProvider:
     COLLABORATION_LOGGING: true
     COLLABORATION_SERVER_ORIGIN: https://impress.127.0.0.1.nip.io
     COLLABORATION_SERVER_SECRET: my-secret
+    Y_PROVIDER_API_KEY: my-secret
 
 ingress:
   enabled: true