vam: fix panic in upcast() from union to union#7008
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In runtime/vam/expr/function.Upcast.toUnion, when casting from a union, the loop that calls toUnionValue can produce multiple vectors with the same type (as when casting from <int8|int32|string> to <int64|string>), triggering a panic when those vectors are passed to vector.NewUnion. Fix by merging same-type vectors with vector.MergeSameTypesInDynamic.
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In runtime/vam/expr/function.Upcast.toUnion, when casting from a union, the loop that calls toUnionValue can produce multiple vectors with the same type (as when casting from <int8|int32|string> to <int64|string>), triggering a panic when those vectors are passed to vector.NewUnion. Fix by merging same-type vectors with vector.MergeSameTypesInDynamic.
Depends on #7007.