[EAGLE] many fixes for eagle (#4195)

Co-authored-by: SangBin Cho <rkooo567@gmail.com>
Co-authored-by: Sehoon Kim <sehoon@x.ai>

python/sglang/srt/managers/scheduler.py

@@ -957,11 +957,13 @@ class Scheduler:
                 self.req_to_token_pool.free(self.chunked_req.req_pool_idx)
                 self.batch_is_full = False
 
+            # Filter batch
             last_bs = self.last_batch.batch_size()
             self.last_batch.filter_batch()
             if self.last_batch.batch_size() < last_bs:
                 self.batch_is_full = False
 
+            # Merge the new batch into the running batch
             if not self.last_batch.is_empty():
                 if self.running_batch is None:
                     self.running_batch = self.last_batch