Reduce risk of collision in temp directory creation #160
+284
−5
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.NET's GetTempFileName is somewhat prone to collision, per dotnet/runtime#73793
We only use to to "reserve" a name for a directory, but so import the new CreateTempSubdirectoryCore method from .NET 7 and use that, as it fixes the collision issue and removes the extra file creation/deletion steps.
This also allows us to tag the temp directories with a "t4 prefix.