Feat: Add Email and DuckDuckGo and Wikipedia Operator #3221 (#9090)

### What problem does this PR solve?

Feat: Add Email and DuckDuckGo and Wikipedia Operator #3221

### Type of change


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

web/src/pages/agent/canvas/node/dropdown/next-step-dropdown.tsx

@@ -104,6 +104,9 @@ function AccordionOperators() {
               Operator.ExeSQL,
               Operator.Google,
               Operator.YahooFinance,
+              Operator.Email,
+              Operator.DuckDuckGo,
+              Operator.Wikipedia,
             ]}
           ></OperatorItemList>
         </AccordionContent>