Migrate ready.Controller to SSA status updates

[fwiesel]

Replace PatchHypervisorStatusWithRetry with Status().Apply() for ConditionTypeReady. Seed only that condition so SSA does not claim ownership over conditions written by other controllers.

Note: this PR does not yet remove internal/utils/status_patch.go — that happens in the final ssa-cleanup PR (#TBD) once every other controller has migrated.

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/ready	73.21% (+73.21%)	🌟

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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/ready/controller.go	73.21% (+73.21%)	56 (+56)	41 (+41)	15 (+15)	🌟

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.