New: Artist info in Album Delete event for Webhooks

Fixes #4552

src/NzbDrone.Core/Notifications/Webhook/WebhookAlbumDeletePayload.cs

@@ -2,6 +2,7 @@ namespace NzbDrone.Core.Notifications.Webhook
 {
     public class WebhookAlbumDeletePayload : WebhookPayload
     {
+        public WebhookArtist Artist { get; set; }
         public WebhookAlbum Album { get; set; }
         public bool DeletedFiles { get; set; }
     }

src/NzbDrone.Core/Notifications/Webhook/WebhookBase.cs

@@ -160,6 +160,7 @@ namespace NzbDrone.Core.Notifications.Webhook
                 EventType = WebhookEventType.AlbumDelete,
                 InstanceName = _configFileProvider.InstanceName,
                 ApplicationUrl = _configService.ApplicationUrl,
+                Artist = new WebhookArtist(deleteMessage.Album.Artist),
                 Album = new WebhookAlbum(deleteMessage.Album),
                 DeletedFiles = deleteMessage.DeletedFiles
             };