Manual direct debit is using the core method "transitionComponentWithReturnMessage" that is in the Contribution BAO class, though this method is now removed in core (see civicrm/civicrm-core#18961 for more info), and thus it result in failure when submitting the payment batch.

Here I replaced the calls for this method with "transitionComponents",
given that the former is basicly calling it but just return some extra
feedback messages, and that these returned feedback messages are not
even used or showed back to user in this extension, so it is safe to
just call "transitionComponents" instead.

When using the API v3 `getvalue` action on any entity, it will return
the return value directly, but some places in direct debit importer
assumed that it would return the value indexed by the `result` key.

Here I am changing that so results from this API action are used directly.