New room list: hide favourites and people meta spaces (#29241)

* feat(new room list)!: hide Favourites and People meta spaces when the new room list is enabled

* test(space store): add testcase for new labs flag

* feat(quick settings): hide pin to sidebar and more options and add extra margin

res/css/structures/_QuickSettingsButton.pcss

@@ -104,6 +104,12 @@ Please see LICENSE files in the repository root for full details.
     }
 }
 
+.mx_QuickSettingsButton_ContextMenuWrapper_new_room_list {
+    .mx_QuickThemeSwitcher {
+        margin-top: var(--cpd-space-2x);
+    }
+}
+
 .mx_QuickSettingsButton_icon {
     // TODO remove when all icons have fill=currentColor
     * {