Will resolve a lot of CI complexity: currently we have a three-step assembly build: platform-assembly -> webapp-distro -> platform-distro. That is because some modules in the platform require the webapps to be built (e.g. the Tomcat distro). After the merge, we can have a single assembly build.

With CAM-11950, we also had very concrete problems recently. After merging the Spring Boot starter, the platform-assembly build had a dependency to the webapps, which either uses outdated webapp snapshots or will fail entirely (e.g. after moving to a new version, no webapp snapshot will be available)