Handle API errors / rate limits more gracefully

[rajbos]

The token I am using in a run has run into the rate limit for any API calls. In that case, the dependency-review-action get's an error back and reports:

Error: Dependency review is not supported on this repository. Please ensure that Dependency graph is enabled along with GitHub Advanced Security on private repositories, see https://github.com/devops-actions/load-available-actions/settings/security_analysis

This is misleading, as the action has been working fine before (it's a public repo in a normal user account) and no settings where changed. The token that is used is just out of it's rate limit bounds. Users are send in the wrong direction.

Expected:
Either wait for the ratelimit to reset, or just show the error from the API

I suspect this is the first API call that get's made. Adding more graceful error handling here will already help a lot.