Fix pex3 venv create --link-python for --pex-repository.

[jsirois]

pex3 venv create --link-python for a foreign platform fails when the venv is installed from a --pex-repository:

A distribution for psutil could not be resolved for <local python>.
Found 1 distribution for psutil that does not apply:
1.) The wheel tags for psutil 5.9.5 are cp36-abi3-manylinux_2_12_x86_64, ... which do not match
    the supported tags of <local python>: cp313-cp313-manylinux_2_39_aarch64 ...

The distributions themselves install fine — it is populating the venv's sources that fails. _populate_first_party re-resolves the repository PEX to build the pex-repl script's activated_dists, and that resolve runs against a local interpreter, which a PEX built for the foreign platform alone holds nothing for. _install_from_pex has already resolved the distributions for the target, so this passes those down instead; the PEX_TOOLS=1 ... venv path keeps re-resolving, where the PEX and the interpreter always agree.

This is the combination Pants uses — it always invokes pex3 venv create with --pex-repository — so #3279 is unreachable from Pants without it.

Repro and verification, on a linux aarch64 host:

pex psutil==5.9.5 --platform linux_x86_64-cp-313-cp313 -o psutil.pex
pex3 venv create -d venv --pex-repository psutil.pex --platform linux_x86_64-cp-313-cp313 \
    --python-path $(command -v python3.13) --link-python /opt/python/bin/bob

Before: the error above. After: bin/python, bin/python3 and bin/python3.13 all link to /opt/python/bin/bob, and lib/python3.13/site-packages/psutil/_psutil_linux.abi3.so is ELF 64-bit LSB shared object, x86-64.

test_foreign_target_link_python_from_pex_repository covers it. I could not run it locally — the py310 fixture's CPython 3.10.7 build fails in my environment (ensurepip exits non-zero) — so CI is its first run; the commands above are the same shape by hand. uv run dev-cmd format lint typecheck is green.

Written with Claude Code, as was #3279.

🤖 Generated with Claude Code

https://claude.ai/code/session_012imZdyz1fhVXRNKPjbhSDw

[jsirois]

Supercedes #3285.