Clean up XNNPACK pytest

[kirklandsign]

Summary

Enable a lot of XNNPACK pytest test cases!

Test plan

pytest

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7023

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As of commit d8c42baa2ba3e8b19db3a9bd657255dac78a7948 with merge base 2d51e63d90746381fa5007246071fcac36aa8982 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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