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/scopes/inheritance/nestedCompanionClassVsNestedJava.fir.kt

@@ -42,6 +42,6 @@ class Y: C() {
     init {
         Y().A_Y()
 
-        <!UNRESOLVED_REFERENCE!>Z<!>().<!UNRESOLVED_REFERENCE!>A_C_Z<!>()
+        <!UNRESOLVED_REFERENCE!>Z<!>().A_C_Z()
     }
 }