Replace usage of legacy mountComponent helper with @vue/test-utils
What does this MR do and why?
Related issue: #375529 (closed) / epic &5110 (closed)
This MR removes replaces usages of mountComponent
with @vue/test-utils
(we are splitting this across multiple MRs to simplify review process
Screenshots or screen recordings
N/A
How to set up and validate locally
As long as pipeline is green we should be good to go!
MR acceptance checklist
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