[ET-VK] Add ANY_STORAGE support to embedding

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK] Buckify parakeet #18062
• [ET-VK][qlinear] Add bias support to q4gsw and dq8ca_q4gsw quantized linear ops #18061
• [ET-VK] Add conv1d shaders and dispatch for 1D convolution #18060
• [ET-VK] Implement missing Vulkan operators for Parakeet TDT model #18059
• [ET-VK] Add ANY_STORAGE support to argmax and argmin #18058
• -> [ET-VK] Add ANY_STORAGE support to embedding #18057
• [ET-VK] Add ANY_STORAGE support to repeat #18056
• [ET-VK] Add ANY_STORAGE support to native_layer_norm #18055
• [ET-VK] Add ANY_STORAGE support to softmax and log_softmax #18054
• [ET-VK] Add ANY_STORAGE support to expand_copy #18053
• [ET-VK] Add ANY_STORAGE support to arange and full #18052
• [ET-VK] Generalize constant_pad_nd to support any storage type and packed dimension #18051
• [ET-VK] Add symint infrastructure to VulkanBackend and ComputeGraph #18050
• [ET-VK] Add Vulkan backend support for Parakeet runner and export #18049
• [ET-VK][ez] Fix IndexError in Vulkan partitioner DtypeSetList/TensorRepSetList #18048

Register embedding as ANY_STORAGE. The buffer and texture shaders
already exist and support both storage types.

Differential Revision: D95970161

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18057

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❌ 5 New Failures, 1 Unrelated Failure

As of commit 1c93fe3 with merge base 8a285b7 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_linear_model
• pull / unittest-editable / macos / macos-job (gh)
  Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under '/Users/ec2-user/runner/_work/executorch/executorch/test-infra/.github/actions/check-disk-space'. Did you forget to run actions/checkout before running your local action?
• pull / unittest-editable / windows / windows-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv2_model
• Test CUDA Builds / test-model-cuda-e2e (nvidia, diar_streaming_sortformer_4spk-v2, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t f7a7291157c57dcdff32fdf6ccf9f6b915c753d697762b1c349951e8bdfef57a /exec failed with exit code 134
• Test Metal Backend / test-model-metal-e2e (openai, whisper-large-v3-turbo, non-quantized) / macos-job (gh)
  ##[error]Response status code does not indicate success: 401 (Unauthorized).

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

• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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