go layer: clickable file:lineno links in test output stack traces

[edrex]

I would be nice if file:lineno ranges in stack traces in test output were clickable links.

The current in-tree implementation uses shell-mode for the test output.

Thoughts:

• Other languages output stack traces with the same file:lineno format (Ruby, probably JS and Python too) . Maybe this should be reusable across languages? Could it be a refinement to shell mode or a "minor mode"? IDK how minor modes work.
• There's https://github.com/nlamirault/gotest.el, which introduces a specific Go-Test mode with clickable links and some highlighting. I've done some limited testing of it and it seems to work fine. Maybe we should pull that in to replace the in-tree implementation.

[github-actions]

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