Improvement: Show error message if devices are not provided on development or ad-hoc profile creation

[VeArnold]

When creating development and ad hoc provisioning profiles, Apple requires the existence of suitable test devices on the Apple Developer Portal.

Previous implementations did not check whether appropriate devices were included in the API call.

This lead to 409 responses from App Store Connect API Create Profile endpoint. For example a POST request to the https://api.appstoreconnect.apple.com/v1/profiles endpoint with the following content:

{
   "data":{
      "type":"profiles",
      "attributes":{
         "name":"profile name",
         "profileType":"IOS_APP_DEVELOPMENT"
      },
      "relationships":{
         "certificates":{
            "data":[
               {
                  "id":"13CO2HS7YE",
                  "type":"certificates"
               }
            ]
         },
         "devices":{},
         "bundleId":{
            "data":{
               "type":"bundleIds",
               "id":"22JL9M6NPV"
            }
         }
      }
   }
}

Results in the following response:

{
  "errors" : [ {
    "id" : "97c1dc61-f853-43c1-9996-36997eff095d",
    "status" : "409",
    "code" : "ENTITY_ERROR.RELATIONSHIP.REQUIRED",
    "title" : "Relationship is required but was not provided.",
    "detail" : "The relationship 'devices' is required but was not provided with this request.",
    "source" : {
      "pointer" : "data/relationships/devices"
    }
  } ]
}