HighlightControlFlowUtil: disable assignment to pattern variables

GitOrigin-RevId: 09c4aa42068ce0258543a17546404fcdec952404

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlightingPatterns/ReassignPatternVariable.java

@@ -0,0 +1,7 @@
+class X {
+  void expressions(Object obj) {
+    if (obj instanceof String s) {
+      <error descr="Cannot assign a value to final variable 's'">s</error> = "foo";
+    }
+  }
+}