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Fix incorrect use of `PEX_PYTHON`. (#22994)

This was established in #18433 and only worked due to a Pex bug that
unconditionally stripped `PEX_PYTHON` on PEX boot. the portions of 
#18433 related to the cleanup so described are reverted:

> Additionally when making this change, the Python/pex code was
> refactored so that we always use this Python to run pex, with Python
> either being chosen by pex, or by using PEX_PYTHON env var at
> runtime. I think this is a nice cleanup of the handshake between
> CompletePexEnvironment.create_argv and
> CompletePexEnvironment.environment_dict used to have.

Fixes #22988

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