Removes deprecated preprocess method from the backend interface (#52258)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52258
Removes deprecated preprocess method from the backend interface.
Preprocessing logic should be now registered along with the backend interface (i.e. PyTorchBackendInterface) via the BackendPreprocessFunction.
Also refactored internal dependencies.
ghstack-source-id: 121704837
Test Plan:
Validates all related tests pass:
buck test mode/dev //caffe2/test/cpp/jit:jit -- --exact 'caffe2/test/cpp/jit:jit - BackendTest.ToBackend'
python test/test_jit.py TestBackends
===== Glow
buck test mode/dev //glow/fb/torch_glow/tests:TorchGlowBackendTests
buck test mode/dev //glow/fb/torch_glow/tests:torch_glow_backend_tests
Reviewed By: jackm321
Differential Revision: D26443479
fbshipit-source-id: afdc51ae619ced293d10c7a6a12f3530e4c4e53c
