perf(venv): skip the distutils shim on Python 3.10+

Stop materializing and importing the virtualenv distutils shim for Python 3.10+, where pip and setuptools already ignore the affected install configuration. Keep the shim for Python 3.9 and move the rules_py-specific PATH setup into the existing venv .pth so console scripts remain discoverable.

Match the upstream changes:
pypa/virtualenv#3184
astral-sh/uv#20222

Author: konsti-openai

e2e/cases/cross-repo-610/test.py

@@ -12,8 +12,8 @@
 for p in site.PREFIXES:
     print(" -", p)
 
-# The virtualenv module should have already been loaded at interpreter startup
-assert "_virtualenv" in sys.modules
+# Python 3.10+ does not need the distutils startup shim.
+assert "_virtualenv" not in sys.modules
 
 # Note that we can't assume that a `.runfiles` tree has been created as CI may
 # use a different layout.

e2e/cases/interpreter-features-tkinter/snapshots/amd64_layers_listing.yaml

@@ -3,14 +3,6 @@
 import os
 import sys
 
-# Make wheel-declared console scripts reachable via `subprocess.run("name", ...)`.
-# Use dirname(sys.executable) so this works on Windows too, where the scripts
-# dir is `Scripts/` rather than `bin/`.
-_venv_bin = os.path.dirname(sys.executable)
-if _venv_bin not in os.environ.get("PATH", "").split(os.pathsep):
-    os.environ["PATH"] = _venv_bin + os.pathsep + os.environ.get("PATH", "")
-del _venv_bin
-
 VIRTUALENV_PATCH_FILE = os.path.join(__file__)