mpi4py: enable spawn tests workflow by default

The previous inter-communicator race condition has been fixed. Enable the
workflow by default to catch new regressions.

Signed-off-by: Wenduo Wang <wenduwan@amazon.com>

Author: wenduwan

.github/workflows/ompi_mpi4py.yaml

@@ -109,30 +109,9 @@ jobs:
         retention-days: 2
         name: build-artifacts
 
-  #==============================================
-
-  run_defaults:
-    # This whole set of tests run with mpi4py's defaults.  As of March
-    # 2024, this means disabling the spawn and dynamic tests.  We want
-    # this job of tests to pass.
+  run_tests:
     needs: [ build ]
     uses: ./.github/workflows/ompi_mpi4py_tests.yaml
     with:
-      # This parameter is required, so send a meaningless
-      # environment variable name that will not affect the tests at
-      # all (i.e., the tests will be run with default values).
-      env_name: MAKE_TODAY_AN_OMPI_DAY
-
-  #==============================================
-
-  run_spawn:
-    # This whole set of tests runs explicitly with setting "enable the
-    # spawn tests".  As of March 2024, we know that Open MPI is
-    # failing these tests.
-    needs: [ build ]
-    # Only run if the label "mpi4py" is set on this PR.
-    if: ${{ contains(github.event.pull_request.labels.*.name, 'mpi4py-all') }}
-    uses: ./.github/workflows/ompi_mpi4py_tests.yaml
-    with:
-      # Enable the spawn tests
       env_name: MPI4PY_TEST_SPAWN
+