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

compiler/testData/diagnostics/tests/functionLiterals/unusedLiteral.fir.kt

@@ -1,3 +1,5 @@
+// !DIAGNOSTICS: +UNUSED_LAMBDA_EXPRESSION, +UNUSED_VARIABLE
+
 fun unusedLiteral(){
     { ->
         val i = 1
@@ -9,4 +11,4 @@ fun unusedLiteralInDoWhile(){
     do{ ->
             val i = 1
     } while(false)
-}
+}