[lint] create a workflow consistency linter (#80200)
In order to maintain consistency between jobs, introduce a linter that
checks whether jobs sharing the same `sync-tag` are indeed the same.
`sync-tag` is just a dummy input on the reusable workflow. I chose to
use a dummy input over the following alternatives:
- The job's id isn't great, because we are likely to change a job's id
(say, when upgrading CUDA or linux versions)
- The job's name doesn't work as we have build/test jobs that share the
same name
Pull Request resolved: https://github.com/pytorch/pytorch/pull/80200
Approved by: https://github.com/janeyx99
