feat(playwright-test): scan the world (#6935)
feat(playwright-test): scan the world (#6935)

Running `npx playwright test` results in a cryptic error message that says to check `--help` for more information.

I started to rewrite it, but I think instead it would be much nicer if we just treated `npx playwright test` as an alias for `npx playwright test -c .`. There is a comment in the code that worries this will be slow because it will scan the world. However we need to support this case anyway for the tests-next-to-code pattern.

It looks like this should be fast because we ignore node_modules/.gitignore entries. If this is still too slow we should make it faster. If we can't make it faster we should throw a more specific error telling the user how to make it faster.
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