refactor: remove placeholder join step

tests/wf_contract_manifest/test_generate.py

@@ -92,7 +92,7 @@ def test_generates_the_complete_real_workflow_contract() -> None:
 
     assert len(manifest["operations"]) == 72
     assert len({operation["method"] for operation in manifest["operations"]}) == 72
-    assert len(schemas) == 142
+    assert len(schemas) == 141
     assert len(manifest["components"]["errors"]) == 1
     assert all(
         set(operation["result"]["schema"]) == {"$ref"}