Update image processing in multimodal runner tests.

[pytorchbot]

Summary: .

Differential Revision: D83272875

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14629

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❌ 5 New Failures, 6 Pending

As of commit d6a32b9 with merge base e0dda90 ():

NEW FAILURES - The following jobs have failed:

• pull / test-llama-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 090ce9a8e64fafde30640df984acb87eef7c857408d51095771e3a652d5efcad /exec failed with exit code 1
• pull / test-llama-runner-linux (fp32, xnnpack+custom+qe, linux.arm64.2xlarge, executorch-ubuntu-22.04-gc... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu-22.04-... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / unittest-nxp-neutron / linux-job (gh)
  test_split_group_convolution__2d_1_group_3

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[GregoryComer]

Manually rebasing, fixed minor merge conflicts in extension/llm/apple/ExecuTorchLLM/tests/MultimodalRunnerTest.swift.