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.

src/components/RequestList/index.tsx

@@ -56,7 +56,7 @@ const RequestList: React.FC = () => {
               <RequestItem
                 request={request}
                 key={`request-list-${request.id}`}
-                onDelete={() => revalidate()}
+                revalidateList={() => revalidate()}
               />
             );
           })}