[ET-VK] Implementation of pow.Tensor_Scalar

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK] Introduce specialized implementation for per-row reduction #15161
• [ET-VK] Contiguous buffer implementation for embedding #15160
• -> [ET-VK] Implementation of pow.Tensor_Scalar #15159
• [ET-VK][ez] Introduce a graph config setting to force resize functions to execute #15158
• [ET-VK] Introduce TextureMetadata struct #15157
• [ET-VK][ez] Allow bool tensors to be lowered to ET-VK and add uint8(bool) dtype variants for several compute shaders #15155
• [ET-VK][ez] Make pipeline executable properties be controlled by a different macro #15154
• [ET-VK][ez] Accept sample_kwargs as an argument in several test util functions #15153

Title says it all!

Differential Revision: D84716452

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15159

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❌ 3 New Failures, 2 Unrelated Failures

As of commit 689bc03 with merge base 7349bb5 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 1338244b99fa3add1576394b9378fc6401634d0a5b842924bbe87e2fc8403891 /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 1d07aeb2e74217ff19539d228761be0b536415ee87fc991038f9fd103ad92fb8 /exec failed with exit code 1

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

• pull / unittest-editable / linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following job failed but was present on the merge base:

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

• pull / unittest / linux / linux-job (gh) (trunk failure)

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