feat: support auth in proxy url

[Leksat]

What's the problem this PR addresses?

Adds support for proxy URLs containing auth credentials. For example, http://<username>:<password>@proxy.com:1234

Closes #3684

How did you fix it?

It's really two lines of code. Take the credentials from the URL and pass them to the tunnel library.

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.

[Leksat]

@arcanis windows-latest w/ Node.js 17.x failed with a timeout. Could you please restart it? Previous time it worked.

[arcanis]

Thanks!

[jaunusa]

Is it possible to merge this feature to yarn 3? Otherwise I have to upgrade to rc.18.

[arcanis]

Upgrading to RC should be perfectly fine. RCs are just a way to indicate we may still land a couple of breaking changes; in terms of stability, they're at least as good as stable builds.

[jaunusa]

Good to know, I was wondering why my container crashes while running yarn install (rc.18) in a kubernetes environment. So in that case I'll trust you and will search for a different reason ;)
Thank you for the reply