Added support for acknowledging code of conduct for using public Notebook Gallery (#117)

* minro code edits

* Added support for acknowledging code of conduct

- Added CodeOfConduct component that shows links and a checkbox that must be acknwledged before seeing the public galley
- Added verbose message for notebook publish error (when another notebook with the same name exists in the gallery)
- Added a feature flag for enabling code of conduct acknowledgement

* Added Info Component

* minor edit

* fixed failign tests

* publish tab displayed only when code of conduct accepted

* added code of conduct fetch during publish

* fixed bug

* added test and addressed PR comments

* changed line endings

* added comment

* addressed PR comments

src/Explorer/Tabs/NotebookV2Tab.ts

@@ -166,7 +166,7 @@ export default class NotebookTabV2 extends TabsBase {
               },
               {
                 iconName: "PublishContent",
-                onCommandClick: () => this.publishToGallery(),
+                onCommandClick: async () => await this.publishToGallery(),
                 commandButtonLabel: publishLabel,
                 hasPopup: false,
                 disabled: false,
@@ -456,9 +456,9 @@ export default class NotebookTabV2 extends TabsBase {
     );
   }
 
-  private publishToGallery = () => {
+  private publishToGallery = async () => {
     const notebookContent = this.notebookComponentAdapter.getContent();
-    this.container.publishNotebook(
+    await this.container.publishNotebook(
       notebookContent.name,
       notebookContent.content,
       this.notebookComponentAdapter.getNotebookParentElement()