Allow symints to be created for arguments

[pytorchbot]

Summary

Add test for creating args of SymInt type to be able to use them in view_copy nodes together with the fix to make the test pass.

Test plan

Tested through CI tests.

cc @freddan80 @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16774

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❌ 5 New Failures

As of commit 9a8637b with merge base 7492d0d ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t ab8c70718dd9d05979581fc9ce66b902afeef9a1bc7a9302835acc21dd7b1093 /exec failed with exit code 1
• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-large-v3-turbo, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t cdde12b29fb9403271d93496fc018c80b2f0f6b23e58e1ffd7923d9801a7cf03 /exec failed with exit code 1
• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-small, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 4a5466d3503ecb3d689eba340a74ac414671bb84acdc827f95caf6522a628583 /exec failed with exit code 1
• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-small, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t cca454a7e6287c591cfa7918188c0ed254922bd9bf1f5b73c544c53dd0667b6d /exec failed with exit code 1
• Test CUDA Builds / unittest-cuda / linux-job (gh)
  RuntimeError: Command docker exec -t fb4b91d1b500b6046db0238420e0009d4895f95115e689812ccd8be3eda9f61a /exec failed with exit code 1

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