message: AKS: replace CloudError with ManagedClusterPodIdentityProvisioningError for AAD pod identity provisioning spec
diff: "readOnly": true,
  "properties": {
  "error": {
  - "$ref": "#/definitions/CloudError",
  + "$ref": "#/definitions/ManagedClusterPodIdentityProvisioningError",
  "description": "Pod identity assignment error (if any)."
  }
  }
  ],
  "description": "Details about the pod identity assigned to the Managed Cluster."
  },
  + "ManagedClusterPodIdentityProvisioningError": {
  + "type": "object",
  + "properties": {
  + "error": {
  + "$ref": "#/definitions/ManagedClusterPodIdentityProvisioningErrorBody",
  + "description": "Details about the error."
  + }
  + },
  + "description": "An error response from the pod identity provisioning."
  + },
  + "ManagedClusterPodIdentityProvisioningErrorBody": {
  + "type": "object",
  + "properties": {
  + "code": {
  + "type": "string",
  + "description": "An identifier for the error. Codes are invariant and are intended to be consumed programmatically."
  + },
  + "message": {
  + "type": "string",
  + "description": "A message describing the error, intended to be suitable for display in a user interface."
  + },
  + "target": {
  + "type": "string",
  + "description": "The target of the particular error. For example, the name of the property in error."
  + },
  + "details": {
  + "type": "array",
  + "items": {
  + "$ref": "#/definitions/ManagedClusterPodIdentityProvisioningErrorBody"
  + },
  + "description": "A list of additional details about the error."
  + }
  + },
  + "description": "An error response from the pod identity provisioning."
  + },
  "ManagedClusterPodIdentityException": {
  "properties": {
  "name": {
  