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

[eric-wieser]

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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.

[semorrison]

bors merge

[bors[bot]]

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