[ET-VK] FP Linear benchmark + test op

[HarryHu-art]

Stack from ghstack (oldest at bottom):

• [ET-VK] Quantized linear layer with NV cooperative matrix #17582
• [ET-VK] Experimental FP Linear Implementation with NV cooperative matrix 2 extension #17581
• [ET-VK] Utility file for NVidia extensions #17580
• -> [ET-VK] FP Linear benchmark + test op #17579

A float linear op for testing new linear layer implementations.

Differential Revision: D91945036

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17579

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❌ 4 New Failures, 1 Cancelled Job

As of commit 0bb3839 with merge base 0c87468 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
• pull / android / run-emulator (gh)
  The process '/opt/android/sdk/platform-tools/adb' failed with exit code 224
• pull / test-openvino-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 14bc48535fd58afd4d6c5097458a139b7133c1b04fd1371be678c5048f72e49f /exec failed with exit code 1
• Test Metal Backend / test-model-metal-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-metal) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

CANCELLED JOB - The following job was cancelled. Please retry:

• periodic (gh)

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