ci: Remove unused azure_pipelines ci infra
This infrastructure was used at some point but I do not believe it is
used anymore. We should remove this to reduce the amount of confusion
one has when trying to contribute to pytorch ci.
Signed-off-by: Eli Uriegas <eliuriegasfb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/77364
Approved by: https://github.com/janeyx99
