EvictionController: Add comprehensive test suite

[fwiesel]

Adds a full eviction_controller_test.go covering the eviction reconcile loop. Pure test additions — no production code changes.

Independent of SSA migration; can be merged at any time.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test-refactor

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[github-actions]

Merging this branch will increase overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller	72.88% (+3.98%)	👍

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Coverage by file

Changed unit test files

• github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/eviction_controller_test.go