Add `waitForRouter` test helper
What does this MR do and why?
Adds a helper to conditionally call router.onReady
or router.isReady
based on the active Vue version.
https://gitlab.slack.com/archives/C02719N90MP/p1728014002979929
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
N/A
How to set up and validate locally
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Related to #497749 (closed)
Edited by Shane Maglangit