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

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

@@ -6,8 +6,8 @@ package foobar.a
     import java.*
 
     val a : java.util.List<Int>? = null
-    val a2 : <!OTHER_ERROR!>util.List<Int>?<!> = null
-    val a3 : <!OTHER_ERROR!>LinkedList<Int>?<!> = null
+    val a2 : <!UNRESOLVED_REFERENCE!>util.List<Int>?<!> = null
+    val a3 : <!UNRESOLVED_REFERENCE!>LinkedList<Int>?<!> = null
 
 // FILE: b.kt
 package foobar
@@ -21,7 +21,7 @@ package foobar.a
     import java.util.*
 
     val b : List<Int>? = a
-    val b1 : <!OTHER_ERROR!>util.List<Int>?<!> = a
+    val b1 : <!UNRESOLVED_REFERENCE!>util.List<Int>?<!> = a
 
 // FILE: b.kt
 package foobar