ASP-based solver: split heuristic for duplicate nodes (#39593)

The heuristic for duplicate nodes contains a few typos, and
apparently slows down the solve for specs that have a lot of
sub-optimal choices to be taken.

This is likely because with a lot of sub-optimal choices, the
low priority, flawed heuristic is being used by clingo.

Here I split the heuristic, so complex rules that matter only
if we allow multiple nodes from the same package are used
only in that case.

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