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Sandbox Pex temporary files. (#10772)

Previously temporary files created by Pex and its subprocesses would
leak outside the execution sandbox. For local executions on machines
with limited /tmp space, this could cause large wheel downloads, for
example, to fail. Those cases are now remedied by setting
`--local-execution-root-dir`. For remote executions this should be
mostly harmless. Remote execution sandoxes, like local ones, should
support processes generating large binaries as a standard task and so
the sandbox partition should have adequate space for temporary files as
a consequence. Some operations might become slower in those cases where
/tmp is a generously apportioned tmpfs and the sandbox partition is not.

Fixes #10771

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