Migrate AggregatesController to SSA status updates

[fwiesel]

Replace PatchHypervisorStatusWithRetry with Status().Apply() for ConditionTypeAggregatesUpdated and the Aggregates slice. The error path includes the current Aggregates in the apply to prevent SSA from pruning previously-set values on a transient OpenStack error.

Clearing aggregates to an empty slice uses a targeted merge patch to work around the omitempty limitation in the generated apply configuration type.

Seed only ConditionTypeAggregatesUpdated so SSA does not claim ownership over conditions written by other controllers.

Depends on #335 (ssa-conditions-helpers).

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[fwiesel]

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⚠️ Note: Baseline coverage from ssa-conditions-helpers branch is not available (artifact may be expired). Showing current coverage for changed files only.

Merging this branch will increase overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller	68.58% (+68.58%)	🌟

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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	76.34% (+76.34%)	93 (+93)	71 (+71)	22 (+22)	🌟

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.