[EE/BE] Adding legacy partitioner tests

[cbilgin]

Summary

• Adds the rest of the legacy to_edge and partition tests back.
• bilinear and maxpool2d are the 2 ops where we seem to have problems and have skipped tests as a result.

Test plan

python -m unittest backends/xnnpack/test/ops/*py

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6920

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[github-actions]

Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as Stale.
Feel free to remove the Stale label if you feel this was a mistake.
If you are unable to remove the Stale label please contact a maintainer in order to do so.
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