[profiler] remove unused _push_range and _pop_range (#35028)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35028
removes these methods that are not used anywhere in the codebase. With this we can also remove public declaration of TORCH_API popRange and TORCH_API pushRange since those were the only use cases.
ghstack-source-id: 100560207
Test Plan: CI
Differential Revision: D20531148
fbshipit-source-id: 8ceaf64449c77259a582a38b1137827ff1ab07f7
