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Support tests for BinaryPaths. (#10770)

A BinaryPathRequest can now include a test to run against each found
binary to validate it works and optionally fingerprint it. Eventually
fingerprinting the binary contents should be performed automatically
and the optional test fingerprint mixed in with it when present as
tracked by #10769.

We leverage testing found binaries in PexEnvironment to ensure we find
only interpreter paths compatible with Pex bootstrapping. This plugs an
existing hole not yet encountered in the wild where a Python 2.6 binary
(for example) could be chosen and then PEX file bootstrapping fail as a
result. We additionally fingerprint interpreters passing the version
range test to ensure we detect interpreter upgrades and pyenv shim
switches. Even with the automatic hashing of binaries tracked in #10769
working, we'd still need to do this in the pyenv shim case since the
same shim script can redirect to different interpreters depending on
configuration external to the shim script.

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