[ci] remove auto-label-rocm workflow (#65558)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65558
This will temporarily be replaced by an FB-internal workflow that does
the exact same thing, pending a migration of this workflow to probot.
cc jeffdaily sunway513 jithunnair-amd ROCmSupport
Test Plan: Imported from OSS
Reviewed By: zhouzhuojie, driazati
Differential Revision: D31149105
Pulled By: suo
fbshipit-source-id: 2aa122820ae3b5286774501f5ecfe052bc949dea
