feat: Uses cwd as default workspace folder

[ekwoka]

This basically makes the equivalent of --workspace-folder . the default.

I'd imagine that this is 99% of use cases already, and those that need something else will know they need something else.

I think I covered all the commands this would apply to with the tests.

[ekwoka]

@microsoft-github-policy-service agree

[julienp17]

I agree that this would make life easier and I don't understand why it wasn't by default

[ekwoka]

Guess I got a style thing to fix ☢️

[chrmarti]

CI doesn't seem to pick up the latest commit. Will close and reopen to trigger fresh.