rename torchao.testing.float8 to torchao.testing.training

[vkuzo]

Summary:

Most of the code here is applicable to MX, so making the dir name more
generic.

Test Plan:

./test/float8/test_everything.sh

Reviewers:

Subscribers:

Tasks:

Tags:

[vkuzo]

Stack from ghstack (oldest at bottom):

• make dtensor shared test util more generic #2416
• -> rename torchao.testing.float8 to torchao.testing.training #2415
• fix float8 training TP+SP integration tests #2414

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/2415

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❌ 1 New Failure, 2 Unrelated Failures

As of commit ad2ce62 with merge base 4e3d019 ():

NEW FAILURE - The following job has failed:

• PR Label Check / Check PR Labels (gh)
  Process completed with exit code 1.

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

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

• Run Regression Tests / test (CPU 2.7, linux.4xlarge, torch==2.7.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh) (trunk failure)
  test/quantization/pt2e/test_numeric_debugger.py::TestNumericDebuggerInfra::test_prepare_for_propagation_comparison
• Run Regression Tests / test (CUDA 2.7, linux.g5.12xlarge.nvidia.gpu, torch==2.7.0, cuda, 12.6) / linux-job (gh) (trunk failure)
  test/quantization/pt2e/test_numeric_debugger.py::TestNumericDebuggerInfra::test_prepare_for_propagation_comparison

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