Migrate EvictionReconciler to SSA status updates

[fwiesel]

Replace MergeFromWithOptimisticLock + retry with Status().Apply() for all eviction status updates.

The evictionStatusCfg helper seeds every apply with the full set of owned fields so SSA never prunes values between reconcile cycles. As the sole owner of every condition on the Eviction CR, the reconciler seeds all three condition types on each apply.

The apply configuration constructor for the cluster-scoped Eviction resource takes only a name (no namespace).

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	68.86% (+68.86%)	🌟

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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/eviction_controller.go	61.27% (+61.27%)	173 (+173)	106 (+106)	67 (+67)	🌟

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.