Revert "Arm backend: Add Qwen3 VL E2E coverage"

[zingo]

Reverts #20274 to temporary fix main testing

cc @digantdesai @freddan80 @per @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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❌ 4 New Failures, 3 Unrelated Failures

As of commit 339dff8 with merge base ed6e2e2 ():

NEW FAILURES - The following jobs have failed:

• pull / test-lora-multimethod-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 66f5adec83a2c4aa3eb0d772836564a2762c47fc778da34c0134afdf2ea1a5d2 /exec failed with exit code 1
• pull / test-voxtral-realtime-xnnpack-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 89b303d678dfde084dbf59a9e1e1843bd58821c2373e95924cea9a144917d777 /exec failed with exit code 1
• trunk / test-models-macos-coreml (vit) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos-mps / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script 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 / unittest-nxp-neutron / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (trunk failure)

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[Copilot]

Pull request overview

Reverts the previously added Qwen3-VL end-to-end (full model) test coverage for the Arm backend to unblock/restore mainline testing stability.

Changes:

• Removes the Qwen3-VL full-model E2E pytest suite (text + vision) for TOSA FP, TOSA FP bf16, and VGF no-quant pipelines.
• Eliminates the associated Transformers-based Qwen3VL model wrapper usage from the Arm backend test suite.

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[zingo]

Forwardfix ongoing here also #20328

[zingo]

Forward fix merged instead