feat: simple failed request handling (#474)

When a movie or series is added with radarr or sonarr, if it fails, this changes the media state to
unknown and sends a notification to admins. Client side this will look like a failed state along
with a retry button that will delete the request and re-queue it.

server/lib/notifications/agents/discord.ts

@@ -158,6 +158,15 @@ class DiscordAgent
           }
         );
 
+        if (settings.main.applicationUrl) {
+          fields.push({
+            name: 'View Media',
+            value: `${settings.main.applicationUrl}/${payload.media?.mediaType}/${payload.media?.tmdbId}`,
+          });
+        }
+        break;
+      case Notification.MEDIA_FAILED:
+        color = EmbedColors.RED;
         if (settings.main.applicationUrl) {
           fields.push({
             name: 'View Media',