Daniel van Vugt dee6cf3f6b panel: Ensure already destroyed panels don't receive callbacks
To prevent sporadic shutdown failures:
```
** Message: 17:08:37.707: Shutting down GNOME Shell

(gnome-shell:91892): Gjs-CRITICAL **: 17:08:37.728: Object .Gjs_ui_panel_Panel (0x5b53524fb030), has been already disposed — impossible to access it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
```

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3601>
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