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

compiler/testData/diagnostics/tests/GenericFunctionIsLessSpecific.kt

@@ -1,8 +1,9 @@
+// FIR_IDENTICAL
 // !CHECK_TYPE
 
 // A generic funciton is always less specific than a non-generic one
-fun <T> foo(<!UNUSED_PARAMETER!>t<!> : T) : Unit {}
-fun foo(<!UNUSED_PARAMETER!>i<!> : Int) : Int = 1
+fun <T> foo(t : T) : Unit {}
+fun foo(i : Int) : Int = 1
 
 fun test() {
     checkSubtype<Int>(foo(1))