Remove navigation mutation calls from the elements Vuex store module

The navigation Vuex store module relies on some getters provided by the auth Vuex store module.

The auth module calls, among other things, an action of the selection module, to fetch the user's selection when logging in.

When fetching the user's selection, the selection module sends the selected elements to the elements module, since that's where all of the elements are stored.

The elements module has actions that can move or delete elements. When this happens, we want the elements to be hidden from element lists, so it has to call the module responsible for those element lists. Thus, it cals a mutation on… the navigation module.

Since Pinia stores cannot access Vuex store modules, this loop gets us stuck. An easy way to break this loop is to temporarily disable this element hiding feature, which is purely cosmetic and no longer works if you ever press F5.

Therefore, please remove the two calls to the navigation/addToScheduledDeletion mutation from the elements Vuex store module. This will allow to migrate the elements module (#1142).