device: clean up dispatcher calls when canceling an activation

Ensure the callback for dispatcher calls is not executed, or it will
resume the activation chain we want to interrupt.

https://bugzilla.redhat.com/show_bug.cgi?id=1888348
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/723
(cherry picked from commit 8180b0180b)

src/devices/nm-device.c

@@ -15729,6 +15729,7 @@ _cancel_activation(NMDevice *self)
         priv->fw_state = FIREWALL_STATE_INITIALIZED;
     }
 
+    dispatcher_cleanup(self);
     ip_check_gw_ping_cleanup(self);
 
     /* Break the activation chain */