Fix feed endpoint issues

What does this MR do?

Update the Feed endpoint in the given ways:

• Hide user content if user has not yet posted.
• Add hasUserPosted field in returned JSON.
• Only fetch friend's dailies for the given question ID.

Relevant screenshots

(Add any relevant screenshots of MR's functionality)

Testing

• Wipe all Dailies for the current question.
• Post a Daily with the userId of the main user's friend.
• Get the feed of the main user.
• The content of the dailies should be an empty string.
• The hasUserPosted field should be false.
• Post a Daily with the userId of the main user.
• The content of the dailies should not be an empty string.
• The hasUserPosted field should be true.

Relevant issues

Closes #31 (closed). Closes #32 (closed).

backend-services/feed-service/app/controllers/DailyController.scala

@@ -60,14 +60,14 @@ class DailyController @Inject()(val controllerComponents: ControllerComponents,
    * 
    * @param userId The ID of the user to get the feed for.
    */
-  def getUserFeed(userId: String) = authenticatedUserAction { implicit request: AuthenticationRequest[AnyContent] =>
+  def getUserFeed(userId: String, questionId: String) = authenticatedUserAction { implicit request: AuthenticationRequest[AnyContent] =>
     println("DailyController:getUserFeed")
 
     try {
         if (!ObjectId.isValid(userId)) throw new InvalidRequestBodyException("Invalid query parameter ID format: userId")
 
-        val result: Seq[Daily] = Daily.getUserFeedAsync(new ObjectId(userId), request.jwt)
-        val jsonResult: JsValue = Daily.toJson(result)
+        val (feed, hasPosted): (Seq[Daily], Boolean) = Daily.getUserFeedAsync(new ObjectId(userId), new ObjectId(questionId), request.jwt)
+        val jsonResult: JsValue = Daily.feedToJson(feed, hasPosted)
         Ok(jsonResult)
     } catch {
         case _: TimeoutException => BadRequest("Request timed out")