dApp: Adopt Jest configuration to use Babel correctly for Vuetity a la Cart

[weilbith]

Description

In #2186 we decided to try using Vuetify a la Cart, so we can stub Vuetify components with themselves while still using shallowMount(). To make this working, we need to adopt the Jest setup load the components correctly. So far I was not able to fix that, although having followed many tips in diverse issue conversations.

Acceptance criteria

• Jest can handle imports like import Vuetify, { VListItem } from 'vuetify/lib';

Tasks

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