RabbitMQQuery could benefit from http client factory

[danielmarbach]

Describe the suggested improvement

The RabbitMQQuery currently news up a fixed http client because it has to pass the extracted credentials to the client. By moving it to the http client factory some of the client configuration could be externalized. It might also simplify testing and remove the necessity for having a virtual method.

The tricky part might be that the http client extensions require information to be available at service collection time. We would have to find a way to pass the credentials validated and extracted during the initialization of the query (which means the container is already closed for modifications) to the client being created.

Additional Context

No response