[ET-VK][CI] Add test-vulkan-genai job for Parakeet on NVIDIA GPU runner

[SS-JIA]

Stack from ghstack (oldest at bottom):

• -> [ET-VK][CI] Add test-vulkan-genai job for Parakeet on NVIDIA GPU runner #18335
• [ET-VK][conv1d] Route conv1d to height-packed implementations in export pipeline #18334
• [ET-VK][conv1d] Implement height-packed depthwise conv1d operator #18333
• [ET-VK][conv1d] Implement height-packed pointwise conv1d operator #18332

Add a new GitHub CI job that exports and runs the Parakeet TDT model with
the Vulkan backend on an NVIDIA GPU runner. The Vulkan export and runner
code already exists but had no CI coverage.

• Add --gpu flag to setup-vulkan-linux-deps.sh to skip SwiftShader
  installation when running on machines with a real GPU driver
• Add vulkan as a supported device in export_model_artifact.sh and
  test_model_e2e.sh
• Add test-vulkan-genai job to pull.yml on linux.g5.4xlarge.nvidia.gpu

Differential Revision: D97344728

cc @manuelcandales @digantdesai @cbilgin

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18335

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures, 1 Pending, 3 Unrelated Failures

As of commit d718e09 with merge base bf2243a ():

NEW FAILURES - The following jobs have failed:

• pull / test-vulkan-genai / linux-job (gh)
  RuntimeError: Command docker exec -t c088a069e0bf3b6f5d09057ca8eb01b848cc7dbc85db3b21f480a4e82be6ce16 /exec failed with exit code 2
• pull / test-vulkan-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3269d66f956e834b039b14ad0f8528d9acb5b54b56d7d6bdd9647e4fa521def0 /exec failed 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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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