Clean up some specs to use findByTestid 2

Justin Ho Tuan Duongrequested to merge
justin_ho-use-findByTestid-helper-in-some-specs-2 into master

What does this MR do and why?

By using the shallowMountExtended and mountExtended helpers.

References

Previous MR: !187041 (merged)

Screenshots or screen recordings

No changes to UI.

How to set up and validate locally

$ yarn run jest --watch

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