Feat: Delete the operator node and hide the corresponding sheet #3221 (#9142)

### What problem does this PR solve?

Feat: Delete the operator node and hide the corresponding sheet #3221
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/canvas/node/begin-node.tsx

@@ -33,7 +33,7 @@ function InnerBeginNode({ data, id, selected }: NodeProps<IBeginNode>) {
         id={NodeHandleId.Start}
       ></CommonHandle>
 
-      <section className="flex items-center justify-center gap-2">
+      <section className="flex items-center  gap-2">
         <OperatorIcon name={data.label as Operator}></OperatorIcon>
         <div className="truncate text-center font-semibold text-sm">
           {t(`flow.begin`)}