Run image verification in isolated environments (#51029)

Image verification runs in parallell, and whne they are using same
venv with `uv run` they can override each other's directories while
installing packaegs.
diff --git a/dev/breeze/src/airflow_breeze/utils/run_tests.py b/dev/breeze/src/airflow_breeze/utils/run_tests.py
index 01c1ce4..74cc0c6 100644
--- a/dev/breeze/src/airflow_breeze/utils/run_tests.py
+++ b/dev/breeze/src/airflow_breeze/utils/run_tests.py
@@ -82,7 +82,7 @@
     if slim_image:
         env["TEST_SLIM_IMAGE"] = "true"
     command_result = run_command(
-        ["uv", "run", "pytest", test_path.as_posix(), *pytest_args, *extra_pytest_args],
+        ["uv", "run", "--isolated", "pytest", test_path.as_posix(), *pytest_args, *extra_pytest_args],
         env=env,
         output=output,
         check=False,