test(test_prt_voronoi1.py): intersect cells, skip snapshot in macos-14 ci (#1893)

The Voronoi grid generated in test_prt_voronoi1.py is slightly different on macos-14 for some reason. I haven't been able to reproduce locally. To workaround, skip the snapshot on macos-14 in CI. Also re-enable intersections instead of hardcoding in the same test (intersections seem faster than they used to be) and drop the "node" column before the comparison of prt and mp7 results in test_prt_track_events.py, as this might vary depending which side of a boundary the particle is computed to be on.

Author: wpbonelli

autotest/test_prt_track_events.py

@@ -489,11 +489,13 @@ def all_equal(col, val):
         del mf6_pls["xloc"]
         del mf6_pls["yloc"]
         del mf6_pls["zloc"]
+        del mf6_pls["node"]
         del mp7_pls["sequencenumber"]
         del mp7_pls["particleidloc"]
         del mp7_pls["xloc"]
         del mp7_pls["yloc"]
         del mp7_pls["zloc"]
+        del mp7_pls["node"]
 
         # sort both dataframes
         cols = ["x", "y", "z", "time"]