List scheduled cluster upgrades. Returns all scheduled cluster upgrades for an organisation when no filters are set.

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      "identity": "10a80a7a-1a32-4a74-b592-aa2a4ef691c5",
      "clusterIdentity": "5e08fe67-1274-475d-bd0c-a65b0330507f",
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      "status": "REQUESTED",
      "clusterSlug": "string",
      "environmentSlug": "string",
      "organisationSlug": "string",
      "scheduleRequestDate": "2019-08-24T14:15:22Z",
      "ignoreMaintenanceSchedule": true
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