CAMEL-22957: Support virtual threads

[Croway]

Description

Improve the following component to use virtual threads when possible:

camel-once
camel-azure-eventhubs
camel-mllp
camel-atmosphere-websocket
camel-salesforce
camel-zookeeper-master
camel-docling
camel-smpp

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Tracking

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Apache Camel coding standards and style

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• I have run mvn clean install -DskipTests locally from root folder and I have committed all auto-generated changes.

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[Croway]

@oscerd @davsclaus camel-timer uses java.util.Timer that does not support virtual threads. But I do not think it is worth updating camel-timer since camel-scheduler component does something similar and support virtual threads. Let's discuss if you have another opinion.