feat(controller): support endpointslices to replace endpoints

[davidcheng0922]

Which issue(s) this PR fixes:

longhorn/longhorn#10796

What this PR does / why we need it:

In Kubernetes v1.33, the endpoints resource is deprecated.
This PR updates Longhorn to replace endpoints with endpointslices.

Special notes for your reviewer:

For each ShareManager, there will now be two EndpointSlices:

1. Kubernetes-managed EndpointSlice

• Automatically generated by the kubernetes controller
• Has OwnerReference pointing to the Service

2. Longhorn-managed EndpointSlice

• Explicitly created by longhorn-manager
• Has OwnerReference pointing to the ShareManager

We cannot directly modify the Kubernetes-managed EndpointSlice, since changes will be reverted during reconciliation.
Instead, longhorn-manager creates its own EndpointSlice to support use cases such as Multus.

As a result, a ShareManager Service may have two EndpointSlices. Consumers (e.g., kube-proxy, CNI) will aggregate them into a unified set of endpoints.

Additional documentation or context

https://kubernetes.io/docs/concepts/services-networking/endpoint-slices/

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[derekbit]

@davidcheng0922 Could you resolve the conflict? Thank you.

[davidcheng0922]

Pending