MM-33544 is_following prop in getPosts API methods (#17093)

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/file.go

@@ -407,7 +407,7 @@ func (a *App) MigrateFilenamesToFileInfos(post *model.Post) []*model.FileInfo {
 	fileMigrationLock.Lock()
 	defer fileMigrationLock.Unlock()
 
-	result, nErr := a.Srv().Store.Post().Get(context.Background(), post.Id, false, false, false)
+	result, nErr := a.Srv().Store.Post().Get(context.Background(), post.Id, false, false, false, "")
 	if nErr != nil {
 		mlog.Error("Unable to get post when migrating post to use FileInfos", mlog.Err(nErr), mlog.String("post_id", post.Id))
 		return []*model.FileInfo{}