remove unboxed value build from scalar builder

Author: fedor-miron

ydb/library/yql/public/udf/arrow/block_builder.h

@@ -55,7 +55,6 @@ class IScalarBuilder {
 public:
     virtual ~IScalarBuilder() = default;
     virtual arrow::Datum Build(TBlockItem value) const = 0;
-    virtual arrow::Datum Build(NUdf::TUnboxedValuePod value) const = 0;
 };
 
 inline std::shared_ptr<arrow::DataType> GetArrowType(const ITypeInfoHelper& typeInfoHelper, const TType* type) {