[backport camel-4.18.x] CAMEL-23313: HeaderFilter Strategies - add lowerCase where it's not present - JMS, SJMS, CoAP, Google PubSub

[oscerd]

Backport of #22569 to camel-4.18.x

Parallel PR (not a cherry-pick — source PR #22569 is still open on main).

Adds setLowerCase(true) to five HeaderFilterStrategy implementations for consistency with the other components that already call it (HttpHeaderFilterStrategy, Sqs2HeaderFilterStrategy, MailHeaderFilterStrategy, KafkaHeaderFilterStrategy, etc.):

• camel-jms: JmsHeaderFilterStrategy, ClassicJmsHeaderFilterStrategy
• camel-sjms: SjmsHeaderFilterStrategy
• camel-coap: CoAPHeaderFilterStrategy
• camel-google-pubsub: GooglePubsubHeaderFilterStrategy

Source PR: #22569
Target branch: camel-4.18.x
JIRA: CAMEL-23313

Test plan

• `mvn -DskipTests install` in each affected module (camel-jms, camel-sjms, camel-coap, camel-google-pubsub) on `camel-4.18.x` - all green
• CI will exercise the JMS/SJMS integration tests (require Artemis broker)

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Claude Code on behalf of Andrea Cosentino