Sunset schedule for legacy database secrets
<p>&ensp;&ensp;I maintain a library for Google Apps Script that provides an interface and generation of custom authentication tokens.  I've already transitioned over to generation of tokens from a service account instead of the project secrets.  </p>

<p>&ensp;&ensp;I still see you can get the project secret token even in new firebase projects. Is there a sunset schedule for these? Can users of the library continue to use project secrets or should I start encouraging transition to only using service accounts? </p>