[ty] Improve tests for site-packages discovery
#18374
Merged
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Summary
versionfields inpyvenf.cfgfiles to mdtests. Also make them more expansive.pyvenv.cfgparsing bug #18157 to an mdtestsite_packages.rs, factor out the logic for figuring out where we expect the system-installationsite-packagesto be. Currently we have the same logic twice.Test Plan
cargo test -p ty_python_semantic