Feat: Add Arxiv GoogleScholar operator #3221 (#9102)

### What problem does this PR solve?

Feat: Add Arxiv GoogleScholar 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

@@ -107,6 +107,8 @@ function AccordionOperators() {
               Operator.Email,
               Operator.DuckDuckGo,
               Operator.Wikipedia,
+              Operator.GoogleScholar,
+              Operator.ArXiv,
             ]}
           ></OperatorItemList>
         </AccordionContent>