Properly await setProps to update component

What does this MR do?

setProps() in vue-test-utils is "partially async" and in 1.x will become more async than now. To be safe and to keep our tests green after migration we need to properly await things

Part of &4255 (closed) effort

#240756 (closed)

Screenshots (strongly suggested)

N/A

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Merge request performance guidelines
• Style guides