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

compiler/testData/diagnostics/tests/j+k/kt2619.kt

@@ -1,7 +1,7 @@
 //FILE: foo.kt
 fun main() {
     val c: Type
-    <!NON_EXHAUSTIVE_WHEN!>when<!> (<!UNINITIALIZED_VARIABLE, UNUSED_EXPRESSION!>c<!>)  {
+    <!NON_EXHAUSTIVE_WHEN!>when<!> (<!UNINITIALIZED_VARIABLE!>c<!>)  {
 
     }
 }
@@ -12,4 +12,4 @@ fun main() {
 public enum Type {
     TYPE,
     NO_TYPE;
-}
+}