Upgrade to Camel 4.18.4

[lobtx]

Used the tooling to list and apply changes from camel 4.18.4.

I made some fixes due to this upgrade:

• camel-google-secret-manager : applied https://issues.apache.org/jira/browse/CAMEL-23729 => protobuf rolled-back to ${protobuf-version} instead of ${protobuf4-version} due to google-cloud-secretmanager downgrade to 2.82.0 in Camel 4.18.3
• tests : renamed camel headers
  • operationName→CamelCxfOperationName
  • dns.*→CamelDns*
  • indexId→CamelElasticsearchIndexId

[lobtx]

Tested this branch against an application of mine (local build):

• Karaf 4.4.11
• ActiveMQ 6.2.6
• Camel 4.18.4 & Camel Karaf 4.18.4-SNAPSHOT
• Java 21

This application is quite simple: it exposes a REST API that receives a JSON payload and spreads it across multiple queues, which then forward the message to several endpoints (typical ESB).

I ran the resulting distribution in a local environment: all features install cleanly, and I verified end-to-end that messages flow through ActiveMQ and my Camel routes as expected.

[jbonofre]

Thanks! I would like to merge the other fixes before the update (in order also to test on CI).
There are several issues about the planned version bumps. We should also link the issue to the PR.