Prevent target_id to be matched with multiple catalogids

[albireox]

Currently, in phase 2, there is nothing preventing a target to be matched with multiple catalogids as long as they are all within valid distance in the radial query.

To prevent this we could add an initial window function to the cross-match query, partitioning by target_id and selecting only first_value with the closest distance to catalogid. That query would be treated as a subquery to which we then apply the usual partition to define best.