Refactor the Dataflow dependency management hierarchy

[onobc]

There are currently multiple locations where versions are managed in the Dataflow monorepo.

• Produce a hierarchy diagram clearly showing the parent/child/import relationships of all modules in the monorepo
• Based on the above, consolidate the version management into a single location.
• As we refactor let's add TODO comment on custom version overrides in hopes that we remove it once it is properly managed by the upstream library (ie Spring Boot)
• From a 15minute glance, it seems that almost everything either inherits (ultimately) from either spring-cloud-dataflow-parent or spring-cloud-dataflow-build-dependencies. The twist to the above is that all Skipper modules have parent = spring-cloud-skipper-parent EXCEPT the special snowflake spring-cloud-skipper-server which has parent = spring-cloud-dataflow-parent. It would be ideal if all Skipper modules inherited the same parent.

Here is the commit that shows where the versions had to be overidden.

[klopfdreh]

Hey @onobc does this belongs to #5405 - or do you mean the hierarchies in general?

[onobc]

Hi @klopfdreh , this is more of a general review of the modules inter-dependencies from when we did the move to the monorepo. It needs a review and most likely a refactoring.

[klopfdreh]

Thanks for the clarification. 👍