Prepare onboarding flow for personalisation screens.

Add a BuildSetting to control the display of the personalisation screens.
Add a property to delay the AuthenticationCoordinator from showing any screens.
Add Congratulations screen to onboarding flow.

Riot/Modules/TabBar/MasterTabBarController.m

@@ -73,11 +73,6 @@
 
 @property (nonatomic) BOOL reviewSessionAlertHasBeenDisplayed;
 
-/**
- A flag to indicate that the analytics prompt should be shown during `-addMatrixSession:`.
- */
-@property(nonatomic) BOOL presentAnalyticsPromptOnAddSession;
-
 @end
 
 @implementation MasterTabBarController
@@ -204,20 +199,6 @@
 
     if (!authIsShown)
     {
-        // Check whether the user should be prompted to send analytics.
-        if (Analytics.shared.shouldShowAnalyticsPrompt)
-        {
-            MXSession *mxSession = self.mxSessions.firstObject;
-            if (mxSession)
-            {
-                [self promptUserBeforeUsingAnalyticsForSession:mxSession];
-            }
-            else
-            {
-                self.presentAnalyticsPromptOnAddSession = YES;
-            }
-        }
-        
         [self refreshTabBarBadges];
         
         // Release properly pushed and/or presented view controller
@@ -422,12 +403,6 @@
         return;
     }
     
-    if (self.presentAnalyticsPromptOnAddSession)
-    {
-        self.presentAnalyticsPromptOnAddSession = NO;
-        [self promptUserBeforeUsingAnalyticsForSession:mxSession];
-    }
-    
     // Check whether the controller'€™s view is loaded into memory.
     if (self.homeViewController)
     {
@@ -965,18 +940,6 @@
     return NSNotFound;
 }
 
-#pragma mark -
-
-- (void)promptUserBeforeUsingAnalyticsForSession:(MXSession *)mxSession
-{
-    // Analytics aren't collected on iOS 12 & 13.
-    if (@available(iOS 14.0, *))
-    {
-        MXLogDebug(@"[MasterTabBarController]: Invite the user to send analytics");
-        [self.masterTabBarDelegate masterTabBarController:self shouldPresentAnalyticsPromptForMatrixSession:mxSession];
-    }
-}
-
 #pragma mark - Review session
 
 - (void)presentVerifyCurrentSessionAlertIfNeededWithSession:(MXSession*)session