Add GraphQL type to represent runner machines under CiRunner

Create the necessary types to represent the following query (including RunnerMachinePolicy with :read_runner_machine permission):

{
  runner(id: "gid://gitlab/Ci::Runner/9145") {
    id
    tagList
    machines {
      nodes {
        id
        createdAt
        contactedAt
        
        version
        revision
        status
        
        platformName
        architectureName
        executorName
        ipAddress
      }
    }
  }
}

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