CAMEL-24085: Sync IronMQ envelope header-filtering upgrade notes to 4_18 and 4_14 guides

[oscerd]

The camel-ironmq message envelope header-filtering change (CAMEL-24085, #24828) is backported to 4.18.x (#24905) and 4.14.x (#24907). Per the backport upgrade-guide policy, this adds the matching notes to the camel-4x-upgrade-guide-4_18.adoc (4.18.4 section) and camel-4x-upgrade-guide-4_14.adoc (4.14.9 section) on main, mirroring the knative doc-sync #24768. Docs-only change.

Claude Code on behalf of Andrea Cosentino (@oscerd).

🤖 Generated with Claude Code

[github-actions]

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[gnodet]

LGTM — docs-only change, properly syncs the IronMQ header-filtering upgrade notes to the 4_18 and 4_14 guides on main.

The entries follow the established pattern (same structure and placement as the knative CloudEvents and azure-eventhubs entries). Text clearly explains the behavioral change and migration path for anyone relying on Camel* headers from the message envelope.

Correctly follows the backport upgrade-guide policy: entries for backported changes go on main.

Claude Code on behalf of gnodet — AI-generated review

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