Remove experiment trackers for My Site Default tab

Author: zwarm

libs/analytics/src/main/java/org/wordpress/android/analytics/AnalyticsTracker.java

@@ -866,7 +866,6 @@ public enum Stat {
         MY_SITE_TAB_TAPPED,
         MY_SITE_DASHBOARD_SHOWN,
         MY_SITE_SITE_MENU_SHOWN,
-        MY_SITE_DEFAULT_TAB_EXPERIMENT_VARIANT_ASSIGNED,
         APP_SETTINGS_INITIAL_SCREEN_CHANGED,
         CHANGE_USERNAME_DISPLAYED,
         CHANGE_USERNAME_DISMISSED,

libs/analytics/src/main/java/org/wordpress/android/analytics/AnalyticsTrackerNosara.java

@@ -2227,8 +2227,6 @@ public static String getEventNameForStat(AnalyticsTracker.Stat stat) {
                 return "my_site_dashboard_shown";
             case MY_SITE_SITE_MENU_SHOWN:
                 return "my_site_site_menu_shown";
-            case MY_SITE_DEFAULT_TAB_EXPERIMENT_VARIANT_ASSIGNED:
-                return "my_site_default_tab_experiment_variant_assigned";
             case APP_SETTINGS_INITIAL_SCREEN_CHANGED:
                 return "app_settings_initial_screen_changed";
             case CHANGE_USERNAME_DISPLAYED: