Revert link integrity checks in properties

The DAG test is not needed anymore as the relevant functions are non-DAG save now, and the other check will be moved to the recompute as it is not efficient or save to do it in the links itself.

src/Mod/Test/Document.py

@@ -870,12 +870,14 @@ class UndoRedoCases(unittest.TestCase):
     #to test: try add obj to second group by .Group = []
     grp = prt1.Group
     grp.append(grp2)
-    try:
-        prt1.Group=grp
-    except:
-        pass
-    else:
-        self.fail("No exception at cross geofeaturegroup links")
+    
+    #to test: check if cross CS link works
+    #try:
+    #    prt1.Group=grp
+    #except:
+    #    pass
+    #else:
+    #    self.fail("No exception at cross geofeaturegroup links")
     
     prt2.addObject(grp1)
     grp = grp1.Group