Fix tests to pass in Vue 3

Natalia Tepluhinarequested to merge
ntepluhina-fix-vue-3-wi-tests into master

What does this MR do and why?

This MR adds fixes to various unit tests, making them pass in Vue 3

MR acceptance checklist

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Close #480312 (closed), #480309 (closed), #480236 (closed), #479978 (closed)

Edited by Natalia Tepluhina

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