fix: filter out duplicate dns results

[nirinchev]

This appears to be the cause of the failures we're seeing in mongosh. The logs indicate that we're getting duplicate dns addresses, which causes us to fire up two servers, one of which will inevitably fail due to address being in use. Here's the corresponding log message:

2025-02-26T17:22:33.225Z connection controller INFO  OIDC-PLUGIN [
  { __value: 1002000028 },
  'compass-oidc',
  'Resolved hostnames for local server',
  {
    url: 'http://localhost:37197/redirect',
    urlPort: 37197,
    hostname: 'localhost',
    interfaces: [
      { address: '127.0.0.1', family: 4 },
      { address: '127.0.0.1', family: 4 }
    ]
  }
]