env --debug 2>/dev/full does not abort

[oech3]

Fixes #10593

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/shuf/shuf-reservoir (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/sort/sort-stale-thread-mem (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tail/inotify-dir-recreate (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/basenc/bounded-memory is now passing!

[ChrisDryden]

Do you think it would be possible to follow up these PR's with some sort of regression test so that we validate this behavior in the future?

[ChrisDryden]

I'm just validating locally that the behaviour is matching upstream but would be good to just have those tests to make sure that any changes in the future don't regress.

[oech3]

No. I 1st considered it is possible by .stderr_is("/dev/full") or something, but it did not work on the CI.