[Test] Disable UNUSED_* diagnostics in tests which are not belong to contolFlowAnalysis suite

compiler/testData/diagnostics/tests/dataFlow/WhenSubject.kt

@@ -4,7 +4,7 @@ class BinOp(val operator : String) : Expr
 fun test(e : Expr) {
     if (e is BinOp) {
         when (<!DEBUG_INFO_SMARTCAST!>e<!>.operator) {
-            else -> <!UNUSED_EXPRESSION!>0<!>
+            else -> 0
         }
     }
-}
+}