chore: remove dead AllWorkersBusy handling in KvScheduler (#5869)

Signed-off-by: PeaBrane <yanrpei@gmail.com>

lib/llm/src/kv_router/scheduler.rs

@@ -44,9 +44,6 @@ pub enum KvSchedulerError {
     #[error("no endpoints available to route work")]
     NoEndpoints,
 
-    #[error("all workers busy")]
-    AllWorkersBusy,
-
     #[error("endpoint subscriber shutdown")]
     SubscriberShutdown,
 
@@ -262,12 +259,6 @@ impl KvScheduler {
                         tokio::time::sleep(Duration::from_millis(5)).await;
                         continue;
                     }
-                    // TODO: this is not actually hooked up
-                    Err(KvSchedulerError::AllWorkersBusy) => {
-                        tracing::trace!("all workers busy; waiting for more capacity");
-                        tokio::time::sleep(Duration::from_millis(5)).await;
-                        continue;
-                    }
                     Err(e) => {
                         tracing::error!("error scheduling request: {:?}", e);
                         break;