Add Soft Credit Amount, Soft Credit Type, Soft Credit For, Soft Credit For Contribution ID to contribution export/select fields

These 4 fields are included in 'primary fields' export, but not available when using 'Select Fields for Export' (see screenshot). We want to add them to that flow when search 'match' from search criteria form ('Contributions OR Soft Credits' param) is Soft Credits Only, Soft Credits with Related Hard Credit, or Both.

Please track hours here, this is a Paid Issue Queue item.