Support async notebook publishing (#275)

Handle cases for async notebook publishing. Now `Your published work` tab shows 3 sections - published, under review, and removed notebooks.

Note: The text labels are design placeholders

![image](https://user-images.githubusercontent.com/693092/95799994-3b5fb100-0cab-11eb-86fc-4ded0aeeddb1.png)

src/Utils/GalleryUtils.test.ts

@@ -17,7 +17,9 @@ const galleryItem: IGalleryItem = {
   downloads: 0,
   favorites: 0,
   views: 0,
-  newCellId: undefined
+  newCellId: undefined,
+  policyViolations: undefined,
+  pendingScanJobIds: undefined
 };
 
 describe("GalleryUtils", () => {

src/Utils/GalleryUtils.ts

@@ -323,3 +323,27 @@ export function getTabTitle(tab: GalleryTab): string {
       throw new Error(`Unknown tab ${tab}`);
   }
 }
+
+export function filterPublishedNotebooks(
+  items: IGalleryItem[]
+): {
+  published: IGalleryItem[];
+  underReview: IGalleryItem[];
+  removed: IGalleryItem[];
+} {
+  const underReview: IGalleryItem[] = [];
+  const removed: IGalleryItem[] = [];
+  const published: IGalleryItem[] = [];
+
+  items?.forEach(item => {
+    if (item.policyViolations?.length > 0) {
+      removed.push(item);
+    } else if (item.pendingScanJobIds?.length > 0) {
+      underReview.push(item);
+    } else {
+      published.push(item);
+    }
+  });
+
+  return { published, underReview, removed };
+}