Back out "[quant][observer] Add histogram observer" (#26236)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26236
Original diff broke oss CI. Reverting.
Original commit changeset: 0f047d3349cb
ghstack-source-id: 90125990
Test Plan: testinprod
Reviewed By: hx89
Differential Revision: D17385490
fbshipit-source-id: 4258502bbc0e3a6dd6852c8ce01ed05eee618b1a
