Sample H100 job

[msaroufim]

Based off #1232 by @jeanschmidt

The runner name is linux.aws.h100

We can't use our H100 runners on every commit cause the queue times will be insane so this is a sample job that just runs our fp8 tests - options are trigger on either

1. nightly
2. On some label like h100
3. Manual workflow dispatch

Fp8 nightly test feels like the first useful h100 test we can do but opening this PR mostly as an example so people can write their own jobs

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/1235

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❌ 3 New Failures

As of commit defeb5b with merge base 9b748de ():

NEW FAILURES - The following jobs have failed:

• Run Regression Tests / test (CPU Nightly, linux.4xlarge, --pre torch --index-url https://download.pytorch.org/whl/nightl... / linux-job (gh)
  test/prototype/test_parametrization.py::TestFakeSparsity::test_jit_trace
• Run Regression Tests / test (CUDA 2.5, linux.g5.12xlarge.nvidia.gpu, torch==2.5.0 --index-url https://download.pytorch.o... / linux-job (gh)
  RuntimeError: Command docker exec -t afdd7ebc4de25af394eec30791420fb2402754c60be8810182a6d66790a1de8c /exec failed with exit code 1
• Run Regression Tests / test (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://download.pytorc... / linux-job (gh)
  test/sparsity/test_fast_sparse_training.py::TestRuntimeSemiStructuredSparsity::test_runtime_weight_sparsification_compile

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