CI: also run cloud tests in host-verify workflow

Extend the verify job with a second step running cloud tests, so
CI covers both suites (host 27 + cloud 223, both passing locally
outside the model sandbox; the 40 socket failures reported inside
the sandbox were sandbox artifacts, not code failures).

Generator (host.py HOST_VERIFY_WORKFLOW) and generated workflow
were updated together; template matches the generated file.

host.py

@@ -943,6 +943,7 @@ jobs:
         with:
           python-version: "3.12"
       - run: python3 -m unittest discover -s tests -v
+      - run: python3 -m unittest discover -s cloud/tests -v
 """