Python: Exclude synth preupdate nodes from tt-consistency

... and that should be it 👍 (so that's why I'm allowing the tests to
run on all data-flow nodes again)

Author: RasmusWL

python/ql/consistency-queries/TypeTrackingConsistency.ql

@@ -5,9 +5,9 @@ private import semmle.python.dataflow.new.internal.TypeTrackingImpl
 
 private module ConsistencyChecksInput implements ConsistencyChecksInputSig {
   predicate unreachableNodeExclude(DataFlow::Node n) {
-    not exists(n.getLocation().getFile().getRelativePath())
-    or
     n instanceof DataFlowPrivate::SyntheticPostUpdateNode
+    or
+    n instanceof DataFlowPrivate::SyntheticPreUpdateNode
   }
 }