Upgrading VTU to v1: Remove deprecated `methods` usage in alerts_service_form_spec
What does this MR do
This MR is part of &3856 (closed) and &5102
This change switches from using deprecated methods option in mount / shallowMount to action spies on Vuex
Additional changes "while we are here":
- unify
nextTickas per gitlab-org/frontend/rfcs#47 (closed)
Edited by Illya Klymov