[Backend Tester] Add convolution tests

[GregoryComer]

Add tests for convolution-family operators.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• [Backend Tester] Add SNR validation #12924
• [Backend Tester] Add upsample tests #12856
• [Backend Tester] Add more pointwise op tests #12855
• [Backend Tester] Add pointwise op tests #12854
• [Backend Tester] Add reduction op tests #12853
• [Backend Tester] Add index_put and index_select tests #12852
• [Backend Tester] Add slice and reshape tests #12851
• [Backend Tester] Add permute, transpose, and masked_fill tests #12850
• [Backend Tester] Add embedding tests #12849
• [Backend Tester] Add linear tests #12848
• -> [Backend Tester] Add convolution tests #12847

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12847

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✅ No Failures

As of commit cfc76a3 with merge base 03f6bcc ():
💚 Looks good so far! There are no failures yet. 💚

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