chore: Move health tracking to federation service

Otherwise federation would have to depend on sender

src/api/router/auth.rs

@@ -150,7 +150,7 @@ async fn verify<B: AsRef<[u8]> + Sync>(
 				}
 
 				// Ping the server as healthy
-				services.sending.mark_healthy(&output.origin);
+				services.federation.mark_healthy(&output.origin);
 
 				Ok(output.origin)
 			},