tests for diagnostics in callable `msg` in `torch.testing.assert_close` (#60254)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60254
Before we only tested that the correct error message is returned if `msg` is passed as callable. This adds tests that make sure that
- the inputs passed to the callable are the same inputs passed to `torch.assert_close` and
- the `diagnostics` namespace has the same attributes and types as documented.
Test Plan: Imported from OSS
Reviewed By: ngimel
Differential Revision: D29556354
Pulled By: mruberry
fbshipit-source-id: 9793c6d86fda842b6329381fc03b945eee878464
