[PyTorch] Remove unused dump() methods in vec headers (#63533)

[PyTorch] Remove unused dump() methods in vec headers (#63533)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63533

These methods don't seem to be used, and they use std::cout, which incurs a small code size overhead on platforms using libstdc++ due to std::__ioinit (see #61500). Seems like we can just delete them?
ghstack-source-id: 136163409

Test Plan:
CI

Reviwers: #sentinel, dhruvbird

Reviewed By: dskhudia

Differential Revision: D30412269

fbshipit-source-id: 380b9aa2f9aabc4107188b6b209d2afc1769c0ee