Use API to get prompt values

Summary: To keep it in sync with the JS implementation.

Reviewed By: danielbuechele

Differential Revision: D17208786

fbshipit-source-id: 8d89f33bfef22317266a0ad1e0c5689540d54f9e

src/fb-stubs/UserFeedback.tsx

@@ -10,6 +10,8 @@ export type FeedbackPrompt = {
   postSubmitHeading: string;
   commentPlaceholder: string;
   bodyText: string;
+  predefinedComments: Array<string>;
+  shouldPopup: boolean;
 };
 
 export async function submitRating(rating: number): Promise<void> {
@@ -26,6 +28,3 @@ export async function submitComment(
 export async function getPrompt(): Promise<FeedbackPrompt> {
   throw new Error('Method not implemented.');
 }
-export async function shouldShowPrompt(): Promise<boolean> {
-  throw new Error('Method not implemented.');
-}