nixosTests.forgejo{,-lts}: simplify workflow subtest

This is substantially less hacky and less fragile than the previous
approach that used htmlq to parse the raw html returned by the frontend
and then compared the extracted status against a hardcoded list of known
translated statuses.

Back when this subtest was added, there simply was no API endpoint to
gather this information yet. I had this in my out of tree variant of
Forgejo for a while now.

Requires Forgejo v8.0.0+

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