Enable forward AD in functional.affine_grid

[guilhermeleobas]

Stack from ghstack (oldest at bottom):

• -> Enable forward AD in functional.affine_grid #135494

Fixes #121411

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 982c681 with merge base a4030e3 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• trunk / linux-focal-cuda12.4-py3.10-gcc9-sm86 / test (default, 5, 5, linux.g5.4xlarge.nvidia.gpu) (gh) (similar failure)
  'test/inductor/test_cudacodecache.py::TestCUDACodeCache::test_cuda_load'

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[guilhermeleobas]

@pytorchbot merge

[pytorchmergebot]

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