Fix the stride issue in DecomposeAvgPool2d and add a test for it.

[tirwu01]

Change-Id: I158682ac74347b6ae1404f7830e7b5db2403d442

Summary

[PLEASE REMOVE] See CONTRIBUTING.md's Pull Requests for ExecuTorch PR guidelines.

[PLEASE REMOVE] If this PR closes an issue, please add a Fixes #<issue-id> line.

[PLEASE REMOVE] If this PR introduces a fix or feature that should be the upcoming release notes, please add a "Release notes: " label. For a list of available release notes labels, check out CONTRIBUTING.md's Pull Requests.

Test plan

[PLEASE REMOVE] How did you test this PR? Please write down any manual commands you used and note down tests that you have written if applicable.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13152

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❗ 1 Active SEVs

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• ghstack-mergeability-check and Check labels failing with 'Resource not accessible by integration'

❌ 1 New Failure, 2 Unrelated Failures

As of commit c5fcc4c with merge base 13de356 ():

NEW FAILURE - The following job has failed:

• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t d50206df480a79b01128b4bff27e24aa8d4e89805065530e93a8591cf77d366f /exec 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-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'
• trunk / test-models-arm-zephyr (add) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[tirwu01]

@pytorchbot label ciflow/trunk