Remove generator_test_wrapper for python's generator_test.

The test wrappers were another way to document nonconformant behaviour between
different python backends. We can achieve the same by removing the wrapper
script and adding an if-condition in the test itself based on
api_implementation.Type(). Since we already do that for nonconformance between
pure Python vs. C++ backends, this change makes it easier to look for UPB
nonconformance instead of going through another layer of indirection.

Temporarily, we will need to hardcode the migrated test name in test_upb.yml
because not all tests under google.protobuf.internal support UPB yet.
(UPB testing for selected tests are added in 21e9aa6).

PiperOrigin-RevId: 712672890

.github/workflows/test_upb.yml

@@ -278,7 +278,7 @@ jobs:
         # We will eventually make this into a wildcard rule once all tests
         # have been migrated to be compatible with upb.
         run: |
-          TESTS=(message_test message_factory_test descriptor_test proto_builder_test descriptor_pool_test)
+          TESTS=(message_test message_factory_test descriptor_test proto_builder_test descriptor_pool_test generator_test)
           for test in ${TESTS[@]}; do
             python -m unittest -v google.protobuf.internal.${test}
           done

python/pb_unit_tests/BUILD

@@ -11,8 +11,6 @@ package(default_applicable_licenses = ["//:license"])
 
 licenses(["notice"])
 
-pyproto_test_wrapper(name = "generator_test")
-
 pyproto_test_wrapper(name = "reflection_test")
 
 filegroup(