CAMEL-23630: Document camel-dapr 4.18.x consumer header change in 4.18 upgrade guide

[oscerd]

Documentation sync: camel-dapr (CAMEL-23630) — 4.18 upgrade guide

Adds the camel-dapr upgrade note to camel-4x-upgrade-guide-4_18.adoc (under Upgrading from 4.18.1 to 4.18.3) on main.

Doc-sync follow-up to the 4.18.x backport (#23889) of #23886. Per the project's backport upgrade-guide policy, the version-specific upgrade guides on main are the canonical history across all release lines, so a change shipping in a 4.18.x patch must also be documented in the 4_18 guide on main — not only in the 4_21 guide (where #23886 already added it).

The note mirrors the 4_21 entry: the new DaprHeaderFilterStrategy / headerFilterStrategy option, and the removal of the producer-direction CamelDaprPubSubName / CamelDaprTopic headers from consumed dapr-pubsub exchanges.

The matching 4_14 guide entry (for the 4.14.x backport #23905) is in a separate follow-up: #23907 (this PR had already merged when the 4.14.x backport was prepared).

• Original PR: CAMEL-23630: add HeaderFilterStrategy to camel-dapr #23886
• 4.18.x backport: [backport camel-4.18.x] CAMEL-23630: add HeaderFilterStrategy to camel-dapr #23889
• Docs-only change — no code or build impact.

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Prepared by Claude Code on behalf of Andrea Cosentino · 🤖 Generated with Claude Code

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[gnodet]

Straightforward upgrade guide documentation for the camel-dapr header changes in 4.18.x. Correctly documents:

• The addition of DaprHeaderFilterStrategy
• The removal of CamelDaprPubSubName and CamelDaprTopic from consumer headers (now using Dapr metadata instead)

Documentation is clear and well-structured.

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