The R2DBC channel adapters have wrong componentType
* Fix R2DBC component type to not mention `reactive-`: they are reactive by R2DBC definition
The `ReactiveRedisStreamMessageProducer` calls ack() explicitly
when populates `IntegrationMessageHeaderAccessor.ACKNOWLEDGMENT_CALLBACK` header,
but must provide an implementation of `SimpleAcknowledgment` instead
* Fix `ReactiveRedisStreamMessageProducer` to populate the proper
`IntegrationMessageHeaderAccessor.ACKNOWLEDGMENT_CALLBACK` header and in the proper moment
* Fix `ReactiveRedisStreamMessageProducerTests` to verify that `autoAck=false` works as expected
together with the `IntegrationMessageHeaderAccessor.ACKNOWLEDGMENT_CALLBACK` header functionality
6d6f53fa87