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

compiler/testData/diagnostics/tests/imports/ExplicitPackageImportsAmbiguity.fir.kt

@@ -14,4 +14,4 @@ package c
 import a.x
 import b.x
 
-class Y : <!OTHER_ERROR!>x.X<!>
+class Y : <!UNRESOLVED_REFERENCE!>x.X<!>

compiler/testData/diagnostics/tests/imports/propertyClassFileDependencyRecursion.fir.kt

@@ -1,17 +0,0 @@
-// FILE: propertyClassFileDependencyRecursion.kt
-package test
-
-import other.prop
-
-// Note: "prop" is expected to be unresolved and replaced to Any
-class PropType: <!OTHER_ERROR!>prop<!>
-
-// Note: this time "prop" should be resolved and type should be inferred for "checkTypeProp"
-val checkTypeProp = prop
-
-// FILE: propertyClassFileDependencyRecursionOther.kt
-package other
-
-import test.PropType
-
-val prop: PropType? = null

compiler/testData/diagnostics/tests/imports/propertyClassFileDependencyRecursion.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // FILE: propertyClassFileDependencyRecursion.kt
 package test