[jit] Implement `torch::jit::deregisterOperator` (#35107)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/35107
Test Plan: CI + `bin/test_jit --gtest_filter=JitTest.CustomOperators --gtest_repeat=2`
Differential Revision: D20650516
Pulled By: malfet
fbshipit-source-id: 4a7d939498588c812319e7c1f432d54e6edf2189
