Fixed: Limit Discord embed title length to 256 characters

Co-authored-by: HeyBanditoz <7574664+HeyBanditoz@users.noreply.github.com>
(cherry picked from commit a6a61a016be777972f60f76a63d8e828f96a27cd)

Closes #3796

src/NzbDrone.Core/Notifications/Discord/Discord.cs

@@ -485,7 +485,9 @@ namespace NzbDrone.Core.Notifications.Discord
         {
             var albumTitles = string.Join(" + ", albums.Select(e => e.Title));
 
-            return $"{artist.Name} - {albumTitles}";
+            var title = $"{artist.Name} - {albumTitles}";
+
+            return title.Length > 256 ? $"{title.AsSpan(0, 253)}..." : title;
         }
     }
 }