Skip step when adding a user to a group and promoting him
For some use case, it's not convenient, when adding a user to a group, to wait for him to accept the invitation before to be able to promote him. We've made a small hack to trigger the validation of the user. We need to check how to integrate this to Mobilizon main. From a functional perspective, it's no big deal that a user is added to a group without accepting, but he should somehow be notified he's been added to a group.