[Process] Announce engineers to move secret overrides from secrets.yml to .env

Currently, engineers may have secret overrides present in secrets.yml . Although we have switched to the use of Rails credentials, it does not prevent engineers from continuing to store overrides in secrets.yml

As we plan to move away from Rails Secrets, it might be a good opportunity to ask engineers to move any overrides to .env by a certain date.

This will ensure their local instance does not behave in a different way when we update application code to use Rails credentials.