Script discovery tests

[hilja]

Not 100% if pkgScripts is how you tell it to treat program as a script. These obviously fail.

#1399

[hilja]

I think a whole category of tests are missing, the pnpm program ... is covered really well, but there's just the basic case for pnpm script ... and node -r script.

[webpro]

Feel free to add more cases. Please keep in mind I like to keep it a bit concise/sensible/maintainable, there's no need to test every possible case out there (e.g. that list of bun [command] cases are a bit much imho).

Cases that won't be fixed in this round are still useful to know about and we can t.skip.

[webpro]

Fixed a few cases. Forgot to add: Knip does not aim to implement all the features all the various tools might have. It's on the basis of best-effort. That said, feel free to dive in!