[ET-VK][ez] Refactor yaml configs for SDPA shaders

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK][ez] Don't copy zeros for cache tensors #15580
• [ET-VK][ez] SDPA don't branch based on whether bounds check needed #15579
• [ET-VK][ez] Align SDPA attention weights S dim to the next multiple of 4 #15578
• [ET-VK][ez] Update SDPA test to be able to test different SDPA modes #15577
• -> [ET-VK][ez] Refactor yaml configs for SDPA shaders #15576

Title says it all! Use the new combos codegen API which makes it easier to express generating storage type combinations.

Differential Revision: D86226138

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15576

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❌ 3 New Failures, 5 Unrelated Failures

As of commit 1d91ec8 with merge base bde6b11 ():

NEW FAILURES - The following jobs have failed:

• Build Presets / windows (windows) / build (gh)
• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• Test CUDA Builds / test-models-cuda (linear) / linux-job (gh)
  RuntimeError: Command docker exec -t 32e54bef03265d1abaa8e89a34eb0573cf9a40cfebd84b94c0ae555422a46e65 /exec failed with exit code 1

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-setup-linux-gcc / linux-job (gh) (similar failure)
  ##[error]The operation was canceled.
• pull / unittest / windows / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / unittest-editable / windows / windows-job (gh) (detected as infra flaky with no log or failing log classifier)

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

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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