[EngSys] Improve logging in GitHub Actions

Two levels of logging:

* default
* primary audience is spec authors, not EngSys
* ok to include limited amounts of the most important logs relevant to engsys
* gh rate limits?
* debug
* log as much as possible (within reason)
* gh adds many extra logs by default (e.g. all requests/responses to GH API)
* should be able to re-run most workflows with debug enabled, since the context will be re-played on re-run