[CI] Add bazel py_test checking for Serve

[Yard1]

Why are these changes needed?

Extends the if __name__... snippet test to Serve tests.

The following files are missing it:

python/ray/serve/tests/test_model_wrappers.py
python/ray/serve/tests/test_logs.py
python/ray/serve/tests/test_http_adapters.py

Related issue number

Checks

• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested :(

[simon-mo]

lint and serve passed!