github: Add verbose option to integration tests

Currently it is not possible to see which test output corresponds to
which test exactly. Now before each new test its test name is printed.

Signed-off-by: Monika Kairaityte <monika@kibit.lt>

.github/workflows/test.yml

@@ -28,7 +28,7 @@ jobs:
         if [ -f test-requirements.txt ]; then pip install -r test-requirements.txt; fi
     - name: Run tests in tests/
       run: |
-        python -m unittest tests/*.py
+        python -m unittest -v tests/*.py
       env:
         TESTS_DEBUG: 1
     - name: Run tests in pytests/