[OpenACC] unify reduction and private-like init region recipes (#140652) Between firstprivate, private and reduction init regions, the difference is largely whether or not the temp that is created is initialized or not. Some recent fixes were made to privatization (#135698, #137869) but did not get propagated to reductions, even though they need to return the yield the same things from their init regions. To mitigate this discrepancy in the future, refactor the init region recipes so they can be shared between the three recipe ops. Also add "none" to the OpenACC_ReductionOperator enum for better error checking.
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