Arm backend: Reduce conv2d unit test sizes

[ArmRyan]

Change-Id: Ie5d05bd18a7c985620c109ad4bae495f91522908

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15271

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❗ 1 Active SEVs

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• AWS was down, GHA infrastructure effected / recovering

❌ 6 New Failures, 3 Unrelated Failures

As of commit d46c92f with merge base fedaa2d ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3da70e90d3f5379134b841e7d440738d9e3270c1eca1029f580f5b2f71816d12 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t d777e64f5b495ad6ce9a154b9ea0ce33ab2b0026f5a07291cbb29b1ca281b294 /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 4121fb2c99824a6239248f869aa520b9312b13b29904464356afcf29e67e3906 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t bdc2e5acdd09ce1f8b80bbc70ee1c4bfbce3a248a40c8cb4eb9f1cb26bf785b2 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-weight-only / linux-job (gh)
  RuntimeError: Command docker exec -t af702c5a63ca68e70a2b68f4cbc91bfc83d6cd7b2759f2efc483a9b949d08f8c /exec failed with exit code 2
• Test Metal Backend / export-voxtral-metal-artifact / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)

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[ArmRyan]

failures seem unrelated