Add `waitForRouter` test helper
requested to merge 497749-add-test-helper-to-conditionally-call-nexttick-or-router-isready-when-waiting-for-routerview into master
What does this MR do and why?
Adds a helper to conditionally call router.onReady or router.isReady based on the active Vue version.
MR acceptance checklist
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Screenshots or screen recordings
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How to set up and validate locally
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Related to #497749 (closed)