Update float8 tests to run nightly

[jainapurva]

Update the Float8 tests to run nightly or as an action on CI, instead of running on every PR.

[jainapurva]

Stack from ghstack (oldest at bottom):

• -> Update float8 tests to run nightly #1924

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/1924

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❌ 6 New Failures

As of commit bad7f43 with merge base d456ea1 ():

NEW FAILURES - The following jobs have failed:

• Code Analysis with Ruff / build (3.9) (gh)
  test/float8/test_numerics_integration.py:17:5: F401 [*] torchao.utils.is_sm_at_least_90 imported but unused
• Run Float8 Tests Nightly / test (SM-89, linux.g6.4xlarge.experimental.nvidia.gpu, --pre torch --index-url https://download.p... / linux-job (gh)
  test/float8/test_compile.py::TestGraphBreaks::test_float8_with_graph_break_in_the_middle
• Run Regression Tests / test (CPU 2.5.1, linux.4xlarge, torch==2.5.1 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh)
  test/float8/test_compile.py::TestGraphBreaks::test_float8_with_graph_break_in_the_middle
• Run Regression Tests / test (CUDA 2.5.1, linux.g5.12xlarge.nvidia.gpu, torch==2.5.1 --index-url https://download.pytorch... / linux-job (gh)
  test/float8/test_compile.py::TestGraphBreaks::test_float8_with_graph_break_in_the_middle
• Run Regression Tests / test-nightly (CPU Nightly, linux.4xlarge, --pre torch --index-url https://download.pytorch.org/wh... / linux-job (gh)
  test/float8/test_compile.py::TestGraphBreaks::test_float8_with_graph_break_in_the_middle
• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://downloa... / linux-job (gh)
  test/float8/test_compile.py::TestGraphBreaks::test_float8_with_graph_break_in_the_middle

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