Remove unused code and fix performance issue (#11284)

### What problem does this PR solve?

1. remove redundant code
2. fix miner performance issue

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
- [x] Refactoring

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

agent/canvas.py

@@ -298,8 +298,6 @@ class Canvas(Graph):
                     for kk, vv in kwargs["webhook_payload"].items():
                         self.components[k]["obj"].set_output(kk, vv)
 
-            self.components[k]["obj"].reset(True)
-
         for k in kwargs.keys():
             if k in ["query", "user_id", "files"] and kwargs[k]:
                 if k == "files":