fix(zrpc): clarify Kubernetes EndpointSlice RBAC errors - #5710
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What does this PR do?
Fixes #5617.
The Kubernetes RPC resolver already supports
k8s://<namespace>/<service>:<port>, but when the client service account lacks permission to read EndpointSlices, the old error was misleading and looked like the service was not started.This PR improves that failure path by wrapping EndpointSlice list errors with a clearer message that points to the required RBAC permissions on
endpointslices.discovery.k8s.io(get,list,watch).It also adds a short Kubernetes RPC discovery note to
readme.mdwith the target format and the minimal RBAC example.Tests
go test ./zrpc/...go test ./zrpc/resolver/internal -run 'TestKubeBuilder|TestWrapEndpointSliceListError' -count=1