Knative eventing addon should not provide defaults for incoming/outgoing

Knative eventing addon is adding as default connector http and as default path /.
While this is interesting for configless ui, might be misleading if user misconfigure their channels.
Without the addon, if the user forgot to setup kogito_incoming_stream and do not provide proper configuration for one of the channels, the system wont start.
With the addon, the system will start, but the configuration might not be the expected one and unexpected behaviour might occur (for example, mixing regular RESTinvocations with Event
http ones)
I think we should enforce users to provide a valid configuration for channel events, explicitly indicating which connectors they want to use, so the addon should not provide any default.