Crash on syntax error while loading test files

[CleanCut]

• Stop silently ignoring crashes on some loading paths. Notably, when you specified a dotname for the target to test and the module had a syntax error, then the module was being silently skipped.
• This changes the behavior when targets are being loaded by filename and have a syntax error. Previously we were converting the syntax error into a single test failure representing failing to load the module. Now the crash occurs before we get that far.

Separately, I removed the GitHub action that tries to add a special label for my sponsors.

1. I don't offer that "benefit" anymore
2. The action seems to be broken, anyway.

Resolves #255

[coveralls]

Coverage remained the same at 100.0% when pulling fcecaccedd443242f02b675a614b7936bb1a88d9 on detect-dotname-syntax-error into e75ce6a8f82b06fa07eed1bfb989ef511e4cd195 on main.