CAMEL-23099: Remove camel-test from bom

Author: davsclaus

docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_18.adoc

@@ -13,6 +13,11 @@ See the xref:camel-upgrade-recipes-tool.adoc[documentation] page for details.
 
 == Upgrading from 4.18.0 to 4.18.1
 
+=== camel-bom
+
+The `camel-test` module has been removed from `camel-bom`. This module was included by mistake, as since Camel 4, this is
+not a JAR but a pom.xml file. Camel end users should use the `camel-test-junit5` / `camel-test-junit6` JARs and the others directly.
+
 === camel-yaml-io / camel-xml-io
 
 In the YAML DSL we have renamed `routePolicy` to `routePolicyRef` on the `route` node,