chore: remove unused syncNotion function in ConnectionCards.tsx (#3129)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

frontend/lib/components/ConnectionCards/ConnectionCards.tsx

@@ -10,7 +10,7 @@ interface ConnectionCardsProps {
 export const ConnectionCards = ({
   fromAddKnowledge,
 }: ConnectionCardsProps): JSX.Element => {
-  const { syncGoogleDrive, syncSharepoint, syncDropbox, syncNotion} = useSync();
+  const { syncGoogleDrive, syncSharepoint, syncDropbox } = useSync();
 
   return (
     <div
@@ -35,12 +35,12 @@ export const ConnectionCards = ({
         callback={(name) => syncDropbox(name)}
         fromAddKnowledge={fromAddKnowledge}
       />
-      <ConnectionSection
+      {/* <ConnectionSection
         label="Notion"
         provider="Notion"
         callback={(name) => syncNotion(name)}
         fromAddKnowledge={fromAddKnowledge}
-      />
+      /> */}
     </div>
   );
 };