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

compiler/testData/diagnostics/testsWithStdLib/annotations/jvmOverloads/jvmOverloadsOnPrivate.kt

@@ -16,8 +16,8 @@ fun foo() {
         }
     }
 
-    val <!UNUSED_VARIABLE!>x<!> = object {
+    val x = object {
         <!OVERLOADS_LOCAL!>@kotlin.jvm.JvmOverloads<!> fun foo(s: String = "OK") {
         }
     }
-}
+}