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

compiler/testData/diagnostics/tests/regressions/CoercionToUnit.kt

@@ -1,8 +1,8 @@
-fun foo(<!UNUSED_PARAMETER!>u<!> : Unit) : Int = 1
+fun foo(u : Unit) : Int = 1
 
 fun test() : Int {
     foo(<!CONSTANT_EXPECTED_TYPE_MISMATCH!>1<!>)
-    val <!UNUSED_VARIABLE!>a<!> : () -> Unit = {
+    val a : () -> Unit = {
         foo(<!CONSTANT_EXPECTED_TYPE_MISMATCH!>1<!>)
     }
     return 1