[TESTING] Dump the stacks of a hanging test in the conda-forge tests

The Linux Python 3.12 job of the conda-forge workflow stops printing at
96-98% of the tests and runs into the 45-minute timeout in both
attempts, while 3.13 and 3.14 pass. With xdist and no -v the log does
not show which test hangs. faulthandler_timeout makes pytest dump the
stacks of all threads of a test that runs longer than 15 minutes,
before the step's timeout kills it.

To be reverted once the hang is found.

Author: ndgrigorian

.github/workflows/conda-build-test.yml

@@ -280,11 +280,12 @@ jobs:
             conda activate ${{ env.test-env-name }}
             export SKIP_TENSOR_TESTS=1
 
+            # TODO: temporary, dump the stacks of a test hanging on Linux 3.12
             if [[ "${{ env.python-label }}" == "${{ env.python-ver-test-all-dtypes }}" ]]; then
               export DPNP_TEST_ALL_INT_TYPES=1
-              python -m pytest -ra --pyargs ${{ env.module-name }}.tests
+              python -m pytest -ra -o faulthandler_timeout=900 --pyargs ${{ env.module-name }}.tests
             else
-              python -m pytest -n auto -ra --pyargs ${{ env.module-name }}.tests
+              python -m pytest -n auto -ra -o faulthandler_timeout=900 --pyargs ${{ env.module-name }}.tests
             fi
 
       - name: Run tensor tests