Run python sources with a VenvPex (Cherry-pick of #17700) #17761
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This change makes it so we use a
VenvPex
to run Python sources, which is a speed boost (I measure a gain of about ~500ms, which is also quoted inpex.py
).In order to make this work (specifically ensuring we don't revert the fix for #12055) we now have to weave the complete pex environment through to
VenvPexRequest
.