[FIR] Fix exception in Java scope caused by inherited member with implicit return type

It's caused by checking the return type of an inherited property.
toConeKotlinTypeProbablyFlexible() returns an error type when the
type ref is unresolved instead of throwing.
This "breaks" some override checks and in the added test, it leads
to an additional candidate being created for a synthetic property.
However, the candidate has applicability K2_SYNTHETIC_RESOLVED
and gets filtered out because the real property has a higher
applicability.

#KT-66392 Fixed

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassUseSiteMemberScope.kt

@@ -18,6 +18,8 @@ import org.jetbrains.kotlin.fir.declarations.impl.FirDefaultPropertySetter
 import org.jetbrains.kotlin.fir.declarations.synthetic.FirSyntheticProperty
 import org.jetbrains.kotlin.fir.declarations.synthetic.buildSyntheticProperty
 import org.jetbrains.kotlin.fir.declarations.utils.*
+import org.jetbrains.kotlin.fir.diagnostics.ConeSimpleDiagnostic
+import org.jetbrains.kotlin.fir.diagnostics.DiagnosticKind
 import org.jetbrains.kotlin.fir.java.SyntheticPropertiesCacheKey
 import org.jetbrains.kotlin.fir.java.declarations.FirJavaClass
 import org.jetbrains.kotlin.fir.java.declarations.FirJavaMethod
@@ -890,10 +892,7 @@ class JavaClassUseSiteMemberScope(
     }
 
     private fun FirTypeRef.probablyJavaTypeRefToConeType(): ConeKotlinType {
-        return when (this) {
-            is FirJavaTypeRef -> toConeKotlinTypeProbablyFlexible(session, typeParameterStack)
-            else -> coneType
-        }
+        return toConeKotlinTypeProbablyFlexible(session, typeParameterStack)
     }
 
     // It's either overrides Collection.contains(Object) or Collection.containsAll(Collection<?>) or similar methods