pycompat.ispy3 in tests

[Augie Fackler]

Just not done yet AFAIK. Please feel encouraged to rip them out as you see them.

> On May 24, 2022, at 8:05 PM, Manuel Jacob <me at manueljacob.de> wrote:
> 
> I’ve seen that there are some pycompat.ispy3 left in tests/, while they were removed in mercurial/. Was there a specific reason that they are left in the tests (e.g. the possibility to run new tests with older Mercurial versions) or was the removal just not done yet?
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