Fix set xor return types for abstract sets - #16127
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Fixes #16115.
set.__xor__andfrozenset.__xor__returnNotImplementedfor arbitrarycollections.abc.Setimplementations, allowing reflected dispatch to determine the result type. Preserve the concrete return typefor built-in set operands and return
AbstractSetfor the general case.The new test covers both built-in left operands with an abstract set right operand.