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":

agent/component/base.py

@@ -463,12 +463,15 @@ class ComponentBase(ABC):
         return self._param.outputs.get("_ERROR", {}).get("value")
 
     def reset(self, only_output=False):
-        for k in self._param.outputs.keys():
-            self._param.outputs[k]["value"] = None
+        outputs: dict = self._param.outputs # for better performance
+        for k in outputs.keys():
+            outputs[k]["value"] = None
         if only_output:
             return
-        for k in self._param.inputs.keys():
-            self._param.inputs[k]["value"] = None
+
+        inputs: dict = self._param.inputs # for better performance
+        for k in inputs.keys():
+            inputs[k]["value"] = None
         self._param.debug_inputs = {}
 
     def get_input(self, key: str=None) -> Union[Any, dict[str, Any]]: