[Async] [Websocket entrypoint] Receive messages

[mouligno]

:rainbow: Feature

As an API Consumer, I want to receive messages through my websocket connection establish on a AsyncAPI.

:sunrise_over_mountains: Additional information

:superhero: Acceptance criteria

• [ ] Given an Async API using a WS entrypoint Then i receive a flow of messages when some are processed by the backend

[LiliaEn]

This ticket was tested together with https://github.com/gravitee-io/issues/issues/8255 Please see the scenarios covered in the comments of https://github.com/gravitee-io/issues/issues/8255