[libkineto] Re-enable user-annotations in PyTorch (#75601)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75601
User annotations was previously pushed down to the GPU timelines but was disabled during a refactoring some time back. This patch re-enables it in PyTorch Profiler.
Test Plan: CI Tests
Reviewed By: chaekit
Differential Revision: D34591916
Pulled By: aaronenyeshi
fbshipit-source-id: 3f4d5327b391725f4ce4e3eb16740bac2cd1c618
(cherry picked from commit 4bc07174dfef8fb2ffbefba224773a4618ed203a)
