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

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/ObjectExpression.kt

@@ -5,7 +5,7 @@ fun bar(x: Int): Int = x + 1
 fun foo() {
     val x: Int? = null
 
-    val <!UNUSED_VARIABLE!>a<!> = object {
+    val a = object {
         fun baz() = bar(if (x == null) 0 else <!DEBUG_INFO_SMARTCAST!>x<!>)
         fun quux(): Int = if (x == null) <!DEBUG_INFO_CONSTANT, TYPE_MISMATCH!>x<!> else <!DEBUG_INFO_SMARTCAST!>x<!>
     }