remove gRPC Client DNS RoundRobin setting

[kenjenkins]

Related issue:

• https://github.com/pomerium/pomerium/issues/5307

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[ZPain8464]

We should also remove the entry from the reference.json file:

  "grpc-client-dns-roundrobin": {
    "id": "grpc-client-dns-roundrobin",
    "title": "gRPC Client DNS RoundRobin",
    "path": "/grpc#grpc-client-dns-roundrobin",
    "services": [],
    "type": "bool"
  },

[kenjenkins]

We should also remove the entry from the reference.json file

Yes, thanks for the reminder.