FIR checker: skip error named reference if receiver is unresolved

Currently, FIR reports errors caused by previous resolution failure. For
example with unresolved `a` and `b` in code `a.b`, both `a` and `b` are
highlighted. FE1.0 only highlights `a` since it's the root cause. This
change applies this heuristics when reporting FirDiagnostics.

compiler/testData/diagnostics/tests/smartCasts/intersectionScope/unstableSmartCast.fir.kt

@@ -33,6 +33,6 @@ fun test() {
         x.baz(1).checkType { _<Unit>() }
         x.<!INAPPLICABLE_CANDIDATE!>baz<!>(1, 2)
 
-        x.<!UNRESOLVED_REFERENCE!>foobar<!>().<!INAPPLICABLE_CANDIDATE!>checkType<!> { <!INAPPLICABLE_CANDIDATE!>_<!><String>() }
+        x.<!UNRESOLVED_REFERENCE!>foobar<!>().checkType { <!INAPPLICABLE_CANDIDATE!>_<!><String>() }
     }
 }