Rollup merge of #80572 - thomcc:ok_or_err, r=m-ou-se

Add a `Result::into_ok_or_err` method to extract a `T` from `Result<T, T>`

When updating code to handle the semi-recent deprecation of `compare_and_swap` in favor of `compare_exchange`, which returns `Result<T, T>`, I wanted this. I've also wanted it with code using `slice::binary_search` before.

The name (and perhaps the documentation) is the hardest part here, but this name seems consistent with the other Result methods, and equivalently memorable.

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