Throw a RepoException in GitHubEndpoint for RPC errors
Throw a RepoException in GitHubEndpoint for RPC errors

Errors are usually GitHub availability and not issues with workflows.

PiperOrigin-RevId: 324873946
Change-Id: I04d829a7d7ae593e540f57ce9144754f479c6f19

google/copybara,google/copybara,google/copybara