Rename (Cluster)CachedResourceEndpointSlice to ReplicationEndpointSlice

[gman0]

Follow up to splitting CachedResources and Replication VW as concepts.

(Cluster)CachedResourceEndpointSlice -> ReplicationEndpointSlice

[gman0]

Alternative name ReplicatedAPIExportEndpointSlice? As an example and a precedent https://github.com/kcp-dev/contrib-filteredapiexport-vw/blob/main/sdk/apis/filteredvw/v1alpha1/types_endpointslice.go

[gman0]

The VW is called replication, so the endpoint slice should be in line with that.

[neolit123]

slack discussion for reference:
https://kubernetes.slack.com/archives/C09C7UP1VLM/p1785922234481509
maybe we can touch again on this topic on the community call next week.