CI - fix failing test with Python 3.13 (#6996)

* CI - disable failing test with Python 3.13

Related to #6995

* Revert "CI - disable failing test with Python 3.13"

This reverts commit 8d22846.

* Install setuptools for Python 3.13 CI test

* Fail early if `python dev_tools/modules.py` fails

Exit `check/pytest` early if PYTHONPATH is not reliably set.

Author: pavoljuhas

dev_tools/pypath

@@ -36,10 +36,11 @@ if ! python --version | grep -q -F "Python 3."; then
 fi
 
 _PYPATH_PREFIX="${_PYPATH_BASE_DIR}$(
+    set -o pipefail
     cd "${_PYPATH_BASE_DIR}" &&
         env PYTHONPATH=. python dev_tools/modules.py list --mode folder |
         xargs printf ":${_PYPATH_BASE_DIR}/%s"
-)"
+)" || return $?
 
 [[ $PYTHONPATH == ${_PYPATH_PREFIX}* ]] ||
     export PYTHONPATH="${_PYPATH_PREFIX}${PYTHONPATH:+:}${PYTHONPATH}"

dev_tools/requirements/dev-np2.env.txt

@@ -10,6 +10,10 @@
 -r ../../cirq-google/requirements.txt
 -r ../../cirq-core/cirq/contrib/requirements.txt
 
+# setuptools so we can import dev_tools.modules
+
+setuptools
+
 # pytest-minimal.env.txt without cirq-all-no-contrib.txt ---------------------
 
 -r deps/pytest.txt