enable tests on mx_formats + Blackwell

[vkuzo]

Summary:

triton works on PyTorch nightlies now, so we can reenable local testing
on Blackwell

Test Plan:

pytest test/prototype/mx_formats/ -s -x

Reviewers:

Subscribers:

Tasks:

Tags:

[vkuzo]

Stack from ghstack (oldest at bottom):

• -> enable tests on mx_formats + Blackwell #1905

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/1905

• 📄 Preview Python docs built from this PR

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⏳ 1 Pending, 1 Unrelated Failure

As of commit c15fa1f with merge base d258a11 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run TorchAO Experimental Tests / test-mps-ops (macos-m1-stable) (gh) (trunk failure)
  ModuleNotFoundError: No module named 'importlib_metadata'

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