[FIR] Report UPPER_BOUND_VIOLATED only on checkers stage, fix detection of missing cases and testData

compiler/testData/diagnostics/tests/Bounds.fir.kt

@@ -20,10 +20,10 @@ package boundsWithSubstitutors
 
   class Pair<A, B>
 
-  abstract class C<T : B<Int>, X :  (B<Char>) -> Pair<B<Any>, B<A>>>() : <!UPPER_BOUND_VIOLATED!>B<Any><!>() { // 2 errors
+  abstract class C<T : B<<!UPPER_BOUND_VIOLATED!>Int<!>>, X :  (B<<!UPPER_BOUND_VIOLATED, UPPER_BOUND_VIOLATED!>Char<!>>) -> Pair<B<<!UPPER_BOUND_VIOLATED!>Any<!>>, B<A>>>() : B<<!UPPER_BOUND_VIOLATED!>Any<!>>() { // 2 errors
     val a = B<<!UPPER_BOUND_VIOLATED!>Char<!>>() // error
 
-    abstract val x :  (B<Char>) -> B<Any>
+    abstract val x :  (B<<!UPPER_BOUND_VIOLATED, UPPER_BOUND_VIOLATED!>Char<!>>) -> B<<!UPPER_BOUND_VIOLATED!>Any<!>>
   }