Werk #14735: Agent Bakery: Cleanup orphaned packages

When narrowing down packages using the "Agent bakery packages" agent ruleset, it may happen that a host is assigned to two different agent packages after baking.

This may happen when you start using the abovementioned rule. On baking, this will result in a new agent package for the matched hosts. If nothing else happens to the package that the hosts were assigned to previously, the now-unselected platforms will remain for the previous package.

As they are explicitly unwanted by setting the rule, these orphaned packages are now cleaned up.

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