Review `camel-quarkus-support-reactor-netty` runtime initialized classes

Since the Azure extensions switched to the Vert.x HTTP client, `camel-quarkus-support-reactor-netty` is now only used in the `stitch` extension. So there's potentially some cleaning that could be done in `camel-quarkus-support-reactor-netty` (maybe the extension could even be removed entirely).

Start by inspecting the camel-quarkus-support-reactor-netty extension and its use by the stitch extension, focusing on runtime-initialized classes. Confirm whether any remaining users exist and determine whether cleanup or removal is appropriate; done means the extension contains only necessary configuration or is safely removed.

Written by the indexing model from the issue text.