[core] In Generator, distinguish value yields and exceptions not by type but by control flow. #43413
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Previously we use
isinstance(output_or_exception, Exception)
to find out if this is a raised Exception or a yielded value. This missed one case: yielded Exception. Though this is not likely to happen, it should be fixed for the sake of completeness.Also removed dead code: yield_current_fiber which is not used anywhere.
Fixes #43412