[FIR] Get rid of CandidateApplicability.SYNTHETIC_RESOLVED

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/ResolutionStages.kt

@@ -366,7 +366,7 @@ private fun FirSession.createAdaptedKFunctionType(
 internal object DiscriminateSynthetics : CheckerStage() {
     override suspend fun check(candidate: Candidate, sink: CheckerSink, callInfo: CallInfo) {
         if (candidate.symbol is SyntheticSymbol) {
-            sink.reportApplicability(CandidateApplicability.SYNTHETIC_RESOLVED)
+            sink.reportApplicability(CandidateApplicability.RESOLVED_LOW_PRIORITY)
         }
     }
 }

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

@@ -18,11 +18,7 @@ enum class CandidateApplicability {
     RESOLVED_LOW_PRIORITY,
     RESOLVED_NEED_PRESERVE_COMPATIBILITY, // call resolved successfully, but using new features that changes resolve
     RESOLVED_WITH_ERROR, // call has error, but it is still successful from resolution perspective
-    RESOLVED; // call success or has uncompleted inference or in other words possible successful candidate
-
-    companion object {
-        val SYNTHETIC_RESOLVED: CandidateApplicability = RESOLVED_LOW_PRIORITY
-    }
+    RESOLVED, // call success or has uncompleted inference or in other words possible successful candidate
 }
 
 val CandidateApplicability.isSuccess: Boolean