Back out "D30740897 Add fusion enabled apis" (#64500)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64500
D30740897 (https://github.com/pytorch/pytorch/commit/39aeb3bf63f61664bc6c4a929a80a660365c2a5e) broke caffe2/torch/fb/module_factory/optimizers/tests:test_full_sync_optimizer_needed_coverage (https://fburl.com/test/mb46jxon) and blocked training_platform_unit_tests
{F660271297}
multsect results confirms
```
multisect --config FBCODE_TEST bisect 844424966128796 --workers 16 revisions --begin 09629edc --end fc86b434
D30740897 (https://github.com/pytorch/pytorch/commit/39aeb3bf63f61664bc6c4a929a80a660365c2a5e)
````
{F660271232}
Test Plan:
```
buck test mode/opt //caffe2/torch/fb/module_factory/optimizers/tests:test_full_sync_optimizer_needed_coverage
Started reporting to test run: https://www.internalfb.com/intern/testinfra/testrun/4785074671474181
✓ Pass: caffe2/torch/fb/module_factory/optimizers/tests:test_full_sync_optimizer_needed_coverage - main (3.729)
Summary
Pass: 1
```
Differential Revision: D30753916
fbshipit-source-id: 302fd4113ef1f3069846be03edc2300d82b66719
