etcdserver: add ErrRootRoleNotGranted error code

[LLiuJJ]

etcdserver: add ErrRootRoleNotGranted to better prompt users to grant root privileges to current call etcd's client user.

before:

./etcdctl --user="test1" role list
Password:
{"level":"warn","ts":"2025-02-26T23:05:11.856813+0800","logger":"etcd-client","caller":"v3@v3.6.0-alpha.0/retry_interceptor.go:65","msg":"retrying of unary invoker failed","target":"etcd-endpoints://0xc0000ce000/127.0.0.1:2379","method":"/etcdserverpb.Auth/RoleList","attempt":0,"error":"rpc error: code = PermissionDenied desc = etcdserver: permission denied"}
Error: etcdserver: permission denied

after change:

 /etcdctl --user="test1" role list
Password:
{"level":"warn","ts":"2025-02-26T22:58:17.949208+0800","logger":"etcd-client","caller":"v3@v3.6.0-alpha.0/retry_interceptor.go:65","msg":"retrying of unary invoker failed","target":"etcd-endpoints://0xc000277a40/127.0.0.1:2379","method":"/etcdserverpb.Auth/RoleList","attempt":0,"error":"rpc error: code = FailedPrecondition desc = etcdserver: permission denied, root role is not granted to current user"}
Error: etcdserver: permission denied, root role is not granted to current user

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @LLiuJJ. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed after 21 days if no further activity occurs. Thank you for your contributions.