Feat: Add a switch to control the display of structured output to the agent form. #10427 (#11344)

### What problem does this PR solve?

Feat: Add a switch to control the display of structured output to the
agent form. #10427

### Type of change


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

web/src/pages/agent/canvas/node/dropdown/accordion-operators.tsx

@@ -81,7 +81,6 @@ export function AccordionOperators({
               Operator.DataOperations,
               Operator.VariableAssigner,
               Operator.ListOperations,
-              Operator.VariableAssigner,
               Operator.VariableAggregator,
             ]}
             isCustomDropdown={isCustomDropdown}