Display error details field (especially ExcessResources for create cluster)

[cben]

When creating a cluster and quota is insufficient, all you see is:

$ go run ./cmd/ocm create cluster foo --dry-run --provider=aws --ccs=false --multi-az=false --region=us-east-1 --version=4.6.12 --compute-machine-type=r5.xlarge --compute-nodes=100 
Error: Failed to create cluster: dry run: unable to create cluster: identifier is '401', code is 'CLUSTERS-MGMT-401' and operation identifier is '4c3abc0f-4446-4e6e-9291-84ea86e4593a': Unauthorized due to missing quota
exit status 1

With --debug you see useful details how exactly you exceeded quota:

...
I0317 18:26:39.789504 2082861 dump.go:169] Response body follows
I0317 18:26:39.789941 2082861 dump.go:268] {
  "kind": "Error",
  "id": "401",
  "href": "/api/clusters_mgmt/v1/errors/401",
  "code": "CLUSTERS-MGMT-401",
  "reason": "Unauthorized due to missing quota",
  "details": [
    {
      "kind": "ExcessResources",
      "items": [
        {
          "resource_type": "compute.node.aws",
          "resource_name": "r5.xlarge",
          "availability_zone_type": "single",
          "count": 94,
          "billing_model": "standard"
        }
      ]
    }
  ],
  "operation_id": "5659e603-5c5a-4a6b-8de0-4835f5fe94b9"
}
Error: Failed to create cluster: dry run: unable to create cluster: identifier is '401', code is 'CLUSTERS-MGMT-401' and operation identifier is '5659e603-5c5a-4a6b-8de0-4835f5fe94b9': Unauthorized due to missing quota

This should be part of the normal output.
I don't think we need special formatting for this in ocm create cluster; I think the details field should be dumped, as json, whenever it's present.

[cben]

Another example where this would be useful:

$ ocm create cluster greg --provider aws --region us-east-1
Error: Failed to create cluster: unable to create cluster: identifier is '451', code is 'CLUSTERS-MGMT-451' and operation identifier is '52153cc5-e806-4e6f-b61d-508d9538d2cc': Legal terms should be agreed. See details