Re-enable CI tests (#1760)

This re-enables CI tests on every PR 🎉.
This uses make test-integration, which runs tests sequentially.

In theory, we also have test-integration-parallel but it seems to be very flaky: many tests randomly timeout. I didn't spend too much time investigating this, it's probably worth its own investigation in a separate PR, but for now it's important to re-enable CI tests, even if they are a bit slower.

pyscript.core/tests/integration/test_py_config.py

@@ -67,7 +67,6 @@ class TestConfig(PyScriptTest):
         )
         assert self.console.log.lines[-1] == "config name: app with external config"
 
-    @pytest.mark.skip("NEXT: We need to restore the banner.")
     def test_invalid_json_config(self):
         # we need wait_for_pyscript=False because we bail out very soon,
         # before being able to write 'PyScript page fully initialized'