[typing] ignore mypy false positives in aten_test.py (#52370)

Summary:
Pull Request resolved: #52370

After adding .pyi stubs for torch / caffe2 protos, there were some mypy false positives (#52341). We tell mypy to ignore the offending file here.

Test Plan: Let CI run.

Reviewed By: malfet, dzhulgakov

Differential Revision: D26490302

fbshipit-source-id: 87cdfd7419efdc7abece9ca975a464201732b7a0

mypy.ini

@@ -136,6 +136,9 @@ ignore_errors = True
 [mypy-caffe2.experiments.python.convnet_benchmarks]
 ignore_errors = True
 
+[mypy-caffe2.contrib.aten.aten_test]
+ignore_errors = True
+
 [mypy-caffe2.contrib.aten.docs.sample]
 ignore_errors = True