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

compiler/testData/diagnostics/tests/controlStructures/kt786.kt

@@ -5,8 +5,8 @@ fun foo() : Int {
     val d = 2
     var z = 0
     when(d) {
-        5, 3 -> <!UNUSED_CHANGED_VALUE!>z++<!>
-        <!ELSE_MISPLACED_IN_WHEN!>else<!> -> { <!UNUSED_VALUE!>z =<!> -1000 }
+        5, 3 -> z++
+        <!ELSE_MISPLACED_IN_WHEN!>else<!> -> { z = -1000 }
         <!UNREACHABLE_CODE!>return z -> 34<!>
     }
 <!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
@@ -15,7 +15,7 @@ fun foo() : Int {
 fun fff(): Int {
     var d = 3
     when(d) {
-        4 -> <!UNUSED_EXPRESSION!>21<!>
+        4 -> 21
         return 2<!UNREACHABLE_CODE!><!> -> <!UNREACHABLE_CODE!>return 47<!>
         <!UNREACHABLE_CODE!>bar() -> 45<!>
         <!UNREACHABLE_CODE!>444 -> true<!>
@@ -23,4 +23,4 @@ fun fff(): Int {
     return 34
 }
 
-fun bar(): Int = 8
+fun bar(): Int = 8