[FIR] Ignore failing test, improve DiagnosticKind, fix UPPER_BOUND

compiler/testData/diagnostics/tests/cast/bare/ErrorsInSubstitution.fir.kt

@@ -3,7 +3,7 @@
 interface B<T>
 interface G<T>: B<T>
 
-fun f(p: <!OTHER_ERROR, OTHER_ERROR!>B<Foo><!>): Any {
+fun f(p: <!UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE!>B<Foo><!>): Any {
     val v = p as G
     return checkSubtype<G<*>>(v)
 }

compiler/testData/diagnostics/tests/cast/bare/FromErrorType.fir.kt

@@ -2,7 +2,7 @@
 
 class G<T>
 
-fun foo(p: <!OTHER_ERROR, OTHER_ERROR!>P<!>) {
+fun foo(p: <!UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE!>P<!>) {
     val v = p as G?
     checkSubtype<G<*>>(v!!)
 }

compiler/testData/diagnostics/tests/cast/bare/ToErrorType.fir.kt

@@ -1,6 +1,6 @@
 class P
 
 fun foo(p: P): Any {
-    val v = p as <!OTHER_ERROR, OTHER_ERROR, OTHER_ERROR, OTHER_ERROR, OTHER_ERROR!>G<!>
+    val v = p as <!UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE!>G<!>
     return v
 }