fix: Override UV_PROJECT_ENVIRONMENT in tests

Author: GDYendell

tests/test_example.py

@@ -1,5 +1,6 @@
 import functools
 import json
+import os
 import shlex
 import subprocess
 import tomllib
@@ -33,6 +34,7 @@ def run_pipe(cmd: str, cwd=None) -> str:
         stdout=subprocess.PIPE,
         stderr=subprocess.STDOUT,
         cwd=cwd,
+        env=dict(os.environ, UV_PROJECT_ENVIRONMENT=""),
     )
     output = sp.stdout.decode()
     assert sp.returncode == 0, output