CAMEL-23511: document 4.14.8 camel-jgroups-raft header rename in upgrade guide

[oscerd]

Summary

Doc-sync for the camel-4.14.x backport of #23210 (CAMEL-23511). The maintenance-branch backport intentionally did not touch the upgrade guide — per project policy, the version-specific upgrade-guide files for ALL release lines live on main, so this PR adds the matching entry to camel-4x-upgrade-guide-4_14.adoc here.

The note documents the camel-jgroups-raft header-value rename shipping in 4.14.8 (JGROUPSRAFT_* -> CamelJGroupsRaft*, with the field names unchanged), placed under the existing == Upgrading from 4.14.3 to 4.14.8 section, after the matching camel-lucene entry.

Related

• Original PR (main): CAMEL-23511: camel-jgroups-raft - align Exchange header constant names with Camel naming convention #23210
• Backport PR (camel-4.14.x): [backport camel-4.14.x] CAMEL-23511: camel-jgroups-raft - align Exchange header constant names with Camel naming convention #23245
• Sibling doc-sync (4.18 guide): CAMEL-23511: doc-sync 4.18 upgrade guide for camel-jgroups-raft header rename #23227 (matching 4.18.3 entry, merged)
• JIRA: https://issues.apache.org/jira/browse/CAMEL-23511 (fixVersions include 4.14.8)

Claude Code on behalf of Andrea Cosentino

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