Add batch hierarchy circular reference checks

[sjohansson]

Spawned from Fix code scanning alert - A "TODO" or similar was left in source code, possibly indicating incomplete functionality

The creation of batch hierarchies allows any batch to reference any other batch as parent/child
In most scenarios, this hierarchy is expected to be a dag, acyclic.
The registration of a relationship can check for the introduction of a cyclic or circular reference and warn. This code snippet has not been completed.

Tracking issue for:

• https://github.com/data-solution-automation-engine/DIRECT/security/code-scanning/43