The RegressionZoneFillTests handle issues that are resolved by the zone
filler, so Clipper2 problematic fill belongs there. Otherwise, the
remaining tests should not refill the zones before running DRC because
we expect the DRC to catch errors without needing a refill
(cherry picked from commit 998e749918)
Instead of just checking for the zone outline, we adjust to check the
full fill area of the zones for intersection and overlaps
(cherry picked from commit 954b265839)