add placeholder for lint_setup_py

Author: ohmayr

packages/gapic-generator/noxfile.py

@@ -718,9 +718,9 @@ def lint(session):
     serious code quality issues.
     """
 
+    # TODO(https://github.com/googleapis/google-cloud-python/issues/16186):
     # SKIP: This session was not enforced in the standalone (split) repo 
     # and is disabled here to ensure a "move-only" migration.
-    # See: https://github.com/googleapis/google-cloud-python/issues/16186
     session.skip(
         "Linting was not enforced in the split repo. "
         "Skipping now to avoid changing code during migration. See Issue #16186"
@@ -746,6 +746,14 @@ def lint(session):
     )
 
 
+@nox.session(python=NEWEST_PYTHON)
+def lint_setup_py(session):
+    # TODO(https://github.com/googleapis/google-cloud-python/issues/16186):
+    # SKIP: This session was not enforced in the standalone (split) repo 
+    # and is disabled here to ensure a "move-only" migration.
+    session.skip("Skipping now to avoid changing code during migration. See Issue #16186")
+
+
 @nox.session(python="3.10")
 def blacken(session):
     """Run ruff format.