Add comprehensive tests for kube reconciler functions

[Starttoaster]

Summary

• Add envtest integration tests for all reconciler functions: ReconcileService, ReconcileDeployment, ReconcileStatefulset, ReconcilePersistentVolumeClaim, ReconcileConfigMap, and ReconcileIngress
• Cover create, update, and delete/noop scenarios for each reconciler, including edge cases like selector label changes triggering Deployment/StatefulSet recreation, stale container removal, and stale container field clearing
• Add pure unit tests for filterStaleContainers and filterStaleContainerFields helper functions
• Expand the test suite from 2 to 32 specs

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Note

Low Risk
Test-only changes that expand coverage of Kubernetes reconciler behavior; production reconciliation code is unchanged, but failures could affect CI reliability due to additional envtest scenarios.

Overview
Adds a large set of new Ginkgo specs in reconcilers_test.go, expanding from basic serverSideApply coverage to envtest integration tests for ReconcileConfigMap, ReconcileService, ReconcilePersistentVolumeClaim, ReconcileIngress, ReconcileDeployment, and ReconcileStatefulset across create/update and disabled delete/no-op paths.

Also introduces pure unit tests for filterStaleContainers and filterStaleContainerFields, including cases for selector immutability-triggered Deployment/StatefulSet recreation, stale container removal, and clearing stale optional container fields.

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