perf(admin): unload admin panel when leaving it to preserve performance

Iterates #16043

By unloading the admin panel when leaving it, we can free the memory and also make sure that further updates to the community don't try to update the invisible models from the admins panels, some of which are very heavy.

ui/app/AppLayouts/Chat/ChatLayout.qml

@@ -234,8 +234,7 @@ StackLayout {
     Loader {
         id: communitySettingsLoader
         active: root.rootStore.chatCommunitySectionModule.isCommunity() &&
-                root.isPrivilegedUser &&
-                (root.currentIndex === 1 || !!communitySettingsLoader.item) // lazy load and preserve state after loading
+                root.isPrivilegedUser &&  root.currentIndex === 1
         asynchronous: false // It's false on purpose. We want to load the component synchronously
         sourceComponent: CommunitySettingsView {
             id: communitySettingsView