feat(email connector): checkpoint on email connector 16

connectors/email/src/main/java/io/camunda/connector/email/core/jakarta/JakartaEmailListener.java

@@ -118,7 +118,7 @@ private List<String> createInboxList(Object folderToListen) {
     return switch (folderToListen) {
       case null -> List.of("");
       case List<?> list -> list.stream().map(Object::toString).toList();
-      case String string -> Arrays.stream(string.split(",")).toList();
+      case String string -> List.of(string.split(","));
       default ->
           throw new IllegalStateException(
               "Unexpected value: " + folderToListen + ". List or String was expected");