Delete test workflow (#2624)
Summary:
The workflow was created for testing. Removing it.
Related# https://github.com/pytorch/benchmark/pull/1755
Pull Request resolved: https://github.com/pytorch/benchmark/pull/2624
Reviewed By: huydhn
Differential Revision: D77713334
Pulled By: msaroufim
fbshipit-source-id: edcb9db65b5b524d6dcece1b331628441ad4d740
