[FIR] KT-54410: Report API_NOT_AVAILABLE for classifiers

Callable symbols with SinceKotlin are filtered out by a
resolution stage, but in K1 classifiers and property accessors
report API_NOT_AVAILABLE. K2 filters out properties with
unavailable accessors, but does nothing for classifiers.
This change fixes it.

^KT-54410 Fixed

compiler/resolution.common/src/org/jetbrains/kotlin/resolve/calls/tower/CandidateApplicability.kt

@@ -14,6 +14,8 @@ enum class CandidateApplicability {
 
     /**
      * Candidate is removed from resolve due to SinceKotlin with later version or Deprecation with hidden level.
+     * Note that SinceKotlin does not filter out classifier symbols and property accessors. Those
+     * should lead to API_NOT_AVAILABLE.
      * Provokes UNRESOLVED_REFERENCE.
      */
     HIDDEN,