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Fix uv support under remote caching/execution. (Cherry-pick of #23403) (#23406)

As explained in #23344, a remote cache hit on the process that
creates the uv venv will cause venv creation to be skipped,
and pex will not find that venv locally.

With this change uv venv creation and the pex invocation that
uses it run under the same `Process`, ensuring that they are
always run together or cached together.

This fixes not only the remote caching issue but also a
similar issue with remote execution, when we aren't
guaranteed to run the two processes on the same machine.

Co-authored-by: Benjy Weinberger <benjyw@gmail.com>

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