Migrate camel-zeebe to camel-camunda

camel-zeebe, deprecated since 4.19 in favour of camel-camunda (which has shipped since 4.19 with the same 9 operations), was removed in Camel 4.23. Migrates the dependency, the zeebe: URI scheme (including the jobKey to jobType endpoint option rename), the shared model classes, the 8 CamelZeebe* literal header names, the ZeebeConstants type and the camel.component.zeebe.* configuration keys that camel-camunda shares. All steps are bundled in a single dependency-gated recipe so that later steps still see the camel-zeebe dependency after earlier steps have renamed it. Header names are migrated with explicit old-to-new mappings rather than a prefix rename, since RenameHeaderPrefixes only matches the org.apache.camel.Message setHeader/getHeader methods and not the fluent ProcessorDefinition.setHeader(...) route-builder DSL, unlike RenameHeaders which handles both. gatewayHost/gatewayPort (replaced by grpcAddress, a single URL), ZeebeConstants.DEFAULT_GATEWAY_HOST/PORT (no CamundaConstants counterpart), the new SaaS/REST options, the two zeebe-only model classes (renamed rather than dropped: AbstractZeebeResponse to AbstractCamundaResponse and ZeebeMessage to CamundaMessage, both handled below), worker auto-complete behaviour and the zeebe() Endpoint DSL builder are not covered and need manual review.