[stdlib] [NFC] Remove expanduser tests with empty HOME
#4390
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This is a flaky test that I don't know how it didn't get caught before. In Ubuntu 22.04 this works fine (returns
/etc/passwd
), in 24.04 it doesn't (returns/
). MacOS defaults toUser/runner
instead of the empty string. We shouldn't be concerned with and chase after default OS behavior in this test.