[FE, Java resolve] Support inheritors of sealed Java type without permits clause

This fixes a false negative NO_ELSE_IN_WHEN in K2 and incidentally
also fixes a false positive NO_ELSE_IN_WHEN in K1 since the fix is in
the common code.

#KT-62491 Fixed

core/descriptors.jvm/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaClassDescriptor.kt

@@ -197,7 +197,7 @@ class LazyJavaClassDescriptor(
 
     override fun getSealedSubclasses(): Collection<ClassDescriptor> = if (modality == Modality.SEALED) {
         val attributes = TypeUsage.COMMON.toAttributes()
-        jClass.permittedTypes.mapNotNull {
+        jClass.permittedTypes.mapNotNullTo(mutableListOf()) {
             c.typeResolver.transformJavaType(it, attributes).constructor.declarationDescriptor as? ClassDescriptor
         }.sortedBy { it.fqNameSafe.asString() }
     } else {

core/descriptors.jvm/src/org/jetbrains/kotlin/load/java/lazy/descriptors/SyntheticJavaClassDescriptor.kt

@@ -193,8 +193,8 @@ class SyntheticJavaClassDescriptor(
             get() = this@SyntheticJavaClassDescriptor.isRecord
         override val isSealed: Boolean
             get() = modality == Modality.SEALED
-        override val permittedTypes: Collection<JavaClassifierType>
-            get() = emptyList()
+        override val permittedTypes: Sequence<JavaClassifierType>
+            get() = emptySequence()
         override val lightClassOriginKind: LightClassOriginKind?
             get() = null
         override val methods: Collection<JavaMethod>