Cleanup: disable CORS on oauth-proxy ingress
Cleanup: disable CORS on oauth-proxy ingress

This was only necessary for development purposes (e.g., locally serving
web apps with `ng serve`). There are other solutions for this use case
that do not require CORS, see:

https://angular.io/guide/build#proxying-to-a-backend-server

Change-Id: I3a0ef793d66ac958564cbbc950533931aa027ed3
GitOrigin-RevId: 05bd284205aa7c8f688713e0a9f1f7f217159614

googlecloudrobotics/core,googlecloudrobotics/core,googlecloudrobotics/core