Moved aggregate functions to openstack module

[fwiesel]

No description provided.

[github-actions]

Merging this branch changes the coverage (1 decrease, 1 increase)

Impacted Packages	Coverage Δ	🤖
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller	49.01% (-1.22%)	👎
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/openstack	43.55% (+19.80%)	🎉

---

Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/aggregates_controller.go	48.98% (-14.46%)	49 (-44)	24 (-35)	25 (-9)	💀
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/decomission_controller.go	31.17% (ø)	77	24	53
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/onboarding_controller.go	55.04% (ø)	258	142	116
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/openstack/aggregates.go	79.55% (+79.55%)	44 (+44)	35 (+35)	9 (+9)	🌟

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.