Do not process unknown tokens when simplifying the polyadic expression

Fixes IDEA-246008 "Constant condition" Inspection quick fix removes boolean value from string concatenation when between two values

GitOrigin-RevId: 635e6b5f0b0a102d9c1ddecbbf54315b9b52f2dd

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/unwrapIfStatement/afterStringConcat.java

@@ -0,0 +1,9 @@
+// "Simplify 'b' to true" "true"
+class A {
+    void foo(boolean b) {
+        if (b) {
+            String s = "foo" + true + "bar";
+        }
+        
+    }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/unwrapIfStatement/beforeStringConcat.java

@@ -0,0 +1,9 @@
+// "Simplify 'b' to true" "true"
+class A {
+    void foo(boolean b) {
+        if (b) {
+            String s = "foo" + <caret>b + "bar";
+        }
+        
+    }
+}