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/incompleteCode/pseudocodeTraverseNextInstructions.fir.kt

@@ -1,7 +1,7 @@
 package b
 
 fun foo() {
-    <!UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE!>for (i in <!UNRESOLVED_REFERENCE!>collection<!>) {
+    <!UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE!>for (i in <!UNRESOLVED_REFERENCE!>collection<!>) {
         {
          break
     }