Public gallery improvements (#409)

- [x] Don't show extension in name field for publish
- [x] Open "Your published work" tab after publishing
- [x] Continue showing dialog for Report Abuse status
- [x] For showing COC in Public Gallery tab show backdrop of thumbnails
- [x] Liked -> My Favorites & Your published work -> My published work

src/Explorer/Controls/NotebookGallery/GalleryViewerComponent.less

@@ -7,3 +7,12 @@
   width: 100%;
   font-family: @DataExplorerFont;
 }
+
+.publicGalleryTabContainer {
+  position: relative;
+}
+
+.publicGalleryTabOverlayContent {
+  background: white;
+  padding: 20px;
+}