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/Common/Constants.ts

@@ -7,6 +7,12 @@ export class AuthorizationEndpoints {
   public static common: string = "https://login.windows.net/";
 }
 
+export class CodeOfConductEndpoints {
+  public static privacyStatement: string = "https://aka.ms/ms-privacy-policy";
+  public static codeOfConduct: string = "https://aka.ms/cosmos-code-of-conduct";
+  public static termsOfUse: string = "https://aka.ms/ms-terms-of-use";
+}
+
 export class BackendEndpoints {
   public static localhost: string = "https://localhost:12900";
   public static dev: string = "https://ext.documents-dev.windows-int.net";
@@ -116,6 +122,7 @@ export class Features {
   public static readonly enableTtl = "enablettl";
   public static readonly enableNotebooks = "enablenotebooks";
   public static readonly enableGalleryPublish = "enablegallerypublish";
+  public static readonly enableCodeOfConduct = "enablecodeofconduct";
   public static readonly enableLinkInjection = "enablelinkinjection";
   public static readonly enableSpark = "enablespark";
   public static readonly livyEndpoint = "livyendpoint";