Convert integration/bundle/integration/bundle/python_wheel_test.go to
acceptance tests. I plan to expand these tests to check patchwheel
functionality.
Inside each test there were two runs - with params and without, I've
expanded each run into separate test to reduce total time as this runs
can be done in parallel.
Also add new env var DEFAULT_SPARK_VERSION that matches the one in
integration tests.
The tests are currently enabled on every PR (`CloudLong=true` is
commented out), this can be changed after landing.
Denis Bilenko