[ExecuTorch][WebGPU] et_vk.apply_rotary_emb test suite (export + native golden)

[JulianCloudNTH]

Stack from ghstack (oldest at bottom):

• [ExecuTorch][WebGPU] et_vk.prepack test suite (export + native golden) #20292
• [ExecuTorch][WebGPU] Add et_vk.prepack (constant-tensor packing) for E2E weight loading #20265
• -> [ExecuTorch][WebGPU] et_vk.apply_rotary_emb test suite (export + native golden) #20290
• [ExecuTorch][WebGPU] Add et_vk.apply_rotary_emb (interleaved RoPE) + ValueList multi-output #20264
• [ExecuTorch][WebGPU] et_vk.embedding_q4gsw test suite (export + native golden) #20289
• [ExecuTorch][WebGPU] Add et_vk.embedding_q4gsw (4-bit groupwise-symmetric quantized embedding) #20263

Splits the et_vk.apply_rotary_emb tests into their own diff (op below, tests above), matching the sdpa/update_cache/linear_q4gsw convention, and brings them to the same rigor: a multi-shape config sweep run on-device (prefill + decode) and a library dual-oracle at both shapes.
@exported-using-ghexport

Differential Revision: D108668384

Differential Revision: D108668384

[pytorch-bot]

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• [ROCm] MI350 CI jobs will have longer queue times due to CI migration

❌ 2 New Failures, 4 Unrelated Failures

As of commit 495d5b9 with merge base 0e65ba6 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 47e84b8964cd21483fd01f3120946acbada24ae80a241a7dd463b9e935401d41 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 8944adc38afacfba561a5a9d5e41227106fe3560c0da2c200db6f9b08e02adfe /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 / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (trunk failure)
• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (trunk failure)
• pull / unittest / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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