Add a test target to SwiftPM package.

[shoumikhin]

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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9557

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❌ 3 New Failures

As of commit 1428dca with merge base 5c5b84e ():

NEW FAILURES - The following jobs have failed:

• pull / test-models-linux (phi_4_mini, portable, linux.4xlarge.memory) / linux-job (gh)
  RuntimeError: Model phi_4_mini is not a valid name. Available models are ['mul', 'linear', 'add', 'add_mul', 'softmax', 'dl3', 'edsr', 'emformer_transcribe', 'emformer_predict', 'emformer_join', 'llama2', 'llama', 'llama3_2_vision_encoder', 'lstm', 'mobilebert', 'mv2', 'mv2_untrained', 'mv3', 'vit', 'w2l', 'ic3', 'ic4', 'resnet18', 'resnet50', 'llava', 'efficient_sam', 'qwen2_5', 'phi-4-mini'].
• pull / unittest-arm / linux-job (gh)
  RuntimeError: Command docker exec -t fe909c375c4a5683daf3b3d8a47689e720fca1ff1463310ecd8d5a6e5681c897 /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/passes/test_convert_to_linear.py::TestConvertToLinear::test_fp32_convert_to_linear

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[shoumikhin]

@pytorchbot label "topic: not user facing"