[Merged by Bors] - fix: handle archive and counterexamples correctly when adding port comments

[eric-wieser]

---

I tested this as https://github.com/leanprover-community/mathlib/actions/runs/5562830214 and it produced #19238 which looks correct.

I think it's clear this is not affected by the freeze.

[kim-em]

bors merge

[bors[bot]]

Pull request successfully merged into master.

Build succeeded!

The publicly hosted instance of bors-ng is deprecated and will go away soon.

If you want to self-host your own instance, instructions are here. For more help, visit the forum.

If you want to switch to GitHub's built-in merge queue, visit their help page.

• Build mathlib
• Lint mathlib
• Lint style
• Run tests