Upgrading VTU to v1: Remove deprecated `methods` usage
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 using proper parent component :)
Additional changes "while we are here":
- remove
localVueusage as per #220482 - unify
nextTickas per gitlab-org/frontend/rfcs#47 (closed)
Edited by Illya Klymov