Fix Python Flake8 lint error E721. (#3402)

Summary:
Pull Request resolved: #3402

Lint error E721 occurs when the type() function is used for type comparison instead of the more flexible isinstance().
The isinstance() function can handle subclasses as well.
The codemod only replaces type() function with isinstance() function for type comparison and preserves
the existing code functionality while improving code extensibility for future changes.

Reviewed By: TroyGarden

Differential Revision: D83559508

fbshipit-source-id: c54a8cb7c26c4d081e3fdd649c2e655afef22bc2

Author: aliafzal

torchrec/distributed/tests/test_dynamic_sharding.py

@@ -206,7 +206,7 @@ def are_sharded_ebc_modules_identical(
         val2 = getattr(module2, attr)
 
         assert type(val1) is type(val2)
-        if type(val1) is torch.Tensor:
+        if isinstance(val1, torch.Tensor):
             torch.testing.assert_close(val1, val2)
         else:
             assert val1 == val2