chore(remix-testing): use @remix-run/router directly

[MichaelDeBoey]

Follow-up of #4539

Fixes CI failures

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Latest commit: 6a77a96

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[MichaelDeBoey]

@brophdawg11 was a bit quicker 🙈

Closing this as duplicate of #4757

[brophdawg11]

haha you and logan are both so fast! Jacob and I came across these during some local RR work as well so I had them locally but just got around to putting them into a PR 👍