Fix auto extension resolution breaking tests on windows

[mstoykov]

What?

On Windows due to a mistake in #5016 on windows loading files would not work during the auto extension resolution in some cases and that breaks running the test as a whole.

Why?

This should be working.

Checklist

• I have performed a self-review of my code.
• I have commented on my code, particularly in hard-to-understand areas.
• I have added tests for my changes.
• I have run linter and tests locally (make check) and all pass.

Checklist: Documentation (only for k6 maintainers and if relevant)

Please do not merge this PR until the following items are filled out.

• I have added the correct milestone and labels to the PR.
• I have updated the release notes: link
• I have updated or added an issue to the k6-documentation: grafana/k6-docs#NUMBER if applicable
• I have updated or added an issue to the TypeScript definitions: grafana/k6-DefinitelyTyped#NUMBER if applicable

Related PR(s)/Issue(s)

Fixes #5176

[codebien]

Is there a specific reason for not doing as same as readsource is doing?

k6/internal/loader/readsource.go

Line 20 in 8d016ab

pwdURL := &url.URL{Scheme: "file", Path: filepath.ToSlash(filepath.Clean(pwd)) + "/"}

[joanlopez]

Great @mstoykov, because it seems to fix the issue 👉🏻 #5176 (comment) 🎉

Now, I guess it's about removing prints and all that before final reviews? 🤔 Thanks! 🙌🏻

[mstoykov]

Unfortunately the things that fixes all the cases is the thing that is based on #5228 so the ongoing work to nto actually use esbuild and k6desp for the auto extension resolution.

Hopefully all of that will enter 1.4.0. If not I will back off here to fix the more common case.

[mstoykov]

I will move this to draft so people do not come to review it 😅

[mstoykov]

This is superseded by #5320 which fixes all cases