FIR: avoid wrapping an erroneous type as FirResolvedTypeRef

Instead, use FirErrorTypeRef, a subtype of FirResolvedTypeRef

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

@@ -12,5 +12,5 @@ val s: String = "test"
 fun ff() {
     val a = Test<!UNEXPECTED_SAFE_CALL!>?.<!><!UNRESOLVED_REFERENCE!>FOO<!>
     val b = foo<!UNEXPECTED_SAFE_CALL!>?.<!><!UNRESOLVED_REFERENCE!>s<!>
-    System<!UNEXPECTED_SAFE_CALL!>?.<!><!UNRESOLVED_REFERENCE!>out<!>.<!UNRESOLVED_REFERENCE!>println<!>(a + b)
+    System<!UNEXPECTED_SAFE_CALL!>?.<!><!UNRESOLVED_REFERENCE!>out<!>.println(a + b)
 }

compiler/testData/diagnostics/tests/functionAsExpression/WithGenericParameters.fir.kt

@@ -13,7 +13,7 @@ fun fun_with_where() = fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> <!UNRESOLVED_RE
 fun outer() {
     devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!>() {})
     devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> <!UNRESOLVED_REFERENCE!>T<!>.() {})
-    devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> (): <!UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE!>T<!> = null!!)
+    devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> (): <!UNRESOLVED_REFERENCE!>T<!> = null!!)
     devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> (t: <!UNRESOLVED_REFERENCE!>T<!>) {})
     devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> () where T:A {})
 }

compiler/testData/diagnostics/tests/regressions/kt10843.fir.kt

@@ -1,7 +1,7 @@
 // !WITH_NEW_INFERENCE
 // NI_EXPECTED_FILE
 // See EA-76890 / KT-10843: NPE during analysis
-fun lambda(x : Int?) = x?.<!UNRESOLVED_REFERENCE!>let<!> <!UNRESOLVED_REFERENCE!>l<!> {
+fun lambda(x : Int?) = x?.<!UNRESOLVED_REFERENCE!>let<!> l {
     y ->
     if (y <!UNRESOLVED_REFERENCE!>><!> 0) return@l x
     y