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/resolve/invoke/invokeOnVariableWithExtensionFunctionType.fir.kt

@@ -59,7 +59,7 @@ fun test(a: A, b: B) {
 
         b.(foo)()
 
-        (<!UNRESOLVED_REFERENCE!>b.<!UNRESOLVED_REFERENCE!>foo<!><!>)()
+        (b.<!UNRESOLVED_REFERENCE!>foo<!>)()
 
         foo(b)
         (foo)(b)