[ONNX] Non-global diagnostic context (#100219)
Summary:
* `dynamo_export`, and everything within now access diagnostic context through a maintained local
variable, instead of global.
* Refactored `diagnose_call` decorator to require local diagnostic context, instead of accessing global.
* Modified `test_fx_to_onnx_*.py` tests to only log '*.sarif' logs when `verbose=True`.
* Temporarily removed diagnostics for `OnnxFunction`, as they don't have access to diagnostic context
anymore. These diagnostics will be the responsibility of `onnxscript`, and they will return once
diagnostics system is integrated there.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/100219
Approved by: https://github.com/justinchuby
