[data] Remove frivolous shutdown calls causing test error (#52557)

Closes #52545.

Signed-off-by: Matthew Owen <mowen@anyscale.com>

Author: omatthew98

python/ray/data/tests/test_streaming_executor.py

@@ -766,9 +766,6 @@ def test_create_topology_metadata():
     assert len(map_op2.input_dependencies) == 1
     assert map_op2.input_dependencies[0] == map_op1.id
 
-    # Cleanup
-    executor.shutdown()
-
 
 def test_create_topology_metadata_with_sub_stages():
     """Test that _dump_dag_structure correctly handles sub-stages."""
@@ -817,9 +814,6 @@ def test_create_topology_metadata_with_sub_stages():
     assert sub_stage2.name == "SubStage2"
     assert sub_stage2.id.endswith("_sub_1")
 
-    # Cleanup
-    executor.shutdown()
-
 
 if __name__ == "__main__":
     import sys