Handle comparers for nullable value types in primitive collections #35235
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Fixes #35117
In general, value comparers for value type should target the non-nullable variant of the type. This is because we automatically handle null values internally. However, in this case, a comparer for a nullable tpe was created, which was then used with a collection of non-nullable types. The fix is to use the nullable list comparer if the underlying comparer is for a nullable value type.