FIR: report ambiguity-like errors in type resolve

compiler/testData/diagnostics/testsWithStdLib/annotations/throws.fir.kt

@@ -57,7 +57,7 @@ package abc4
 import kotlin.<!CONFLICTING_IMPORT!>Throws<!>
 import kotlin.jvm.<!CONFLICTING_IMPORT!>Throws<!>
 
-@<!UNRESOLVED_REFERENCE!>Throws<!>(Exception::class)
+@<!OVERLOAD_RESOLUTION_AMBIGUITY!>Throws<!>(Exception::class)
 fun foo1() {}
 
 @kotlin.Throws(Exception::class)
@@ -66,7 +66,7 @@ fun foo2() {}
 @kotlin.jvm.Throws(Exception::class)
 fun foo3() {}
 
-fun foo5(x: <!UNRESOLVED_REFERENCE!>Throws<!>) {}
+fun foo5(x: <!OVERLOAD_RESOLUTION_AMBIGUITY!>Throws<!>) {}
 fun foo6(x: kotlin.Throws) {}
 fun foo7(x: kotlin.jvm.Throws) {}