Check results dtype in index_out

[malfet]

This logic exists for index_put and index_add, but for some reason not for index.out
Skip testing, as this function is not technically exposed on the Python level.

🤖 Generated by Copilot at c688cfd

index_out checks types
avoiding errors in autumn
complex tensors work

Fixes #107698

[pytorch-bot]

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[albanD]

I'm fine with no.
We can have test for this when we move the Executorch out variant OpInfos into core!

[malfet]

@pytorchbot merge

[pytorchmergebot]

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[malfet]

@pytorchbot merge

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