Use API for eligibility check

Summary: Change flipper from using the dodgy webview check that requires auth, to using the interngraph api for eligibility checking.

Reviewed By: passy

Differential Revision: D17498724

fbshipit-source-id: b81fd8b7b0bd36a7fcf73ba05d9885b61e420c61

src/fb-stubs/UserFeedback.tsx

@@ -33,6 +33,3 @@ export async function dismiss(): Promise<void> {
 export async function getPrompt(): Promise<FeedbackPrompt> {
   throw new Error('Method not implemented.');
 }
-export class StarRatingsEligibilityChecker extends Component<{
-  callback: (userIsEligible: boolean) => void;
-}> {}