[SNOW-2464063] bugfix: Fix string representation for year-month subtypes #2601
      
        
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Fixes SNOW-2464063
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We added INTERVAL YEAR TO MONTH type in Private preview for Interval data types. Now in Public preview (not released yet) we are adding two more types INTERVAL YEAR and INTERVAL MONTH. All of these 3 types are represented by same logical_type INTERVAL_YEAR_MONTH. And we use scale column Metadata field to represent the subtype in this case
scale = 0 -> interval year to month
scale = 1 -> interval year
scale = 2 -> interval month
We had this logic in connector to convert this interval year-month to string which only works correctly for interval year to month. This PR updates it to look at scale to fetch correct subtype and create string presentation accordingly.