Allow logging for RetriesExhaustedWithDetailsException

[derjust]

providing a static method to log RetriesExhaustedWithDetailsException -
so user code which hits this exception (like context.output()) or
finishBundle itself logs it - unwrapping the causes

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project, in which case you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

---

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If you signed the CLA as a corporation, please let us know the company's name.

[derjust]

Logical got introduced via #481 - no need for this dedicated PR anymore