Remove missing react-router exports in tests

[markdalgleish]

Some of our tests have unused imports from React Router that are no longer exported, leftover from the Remix migration. Vite builds with these without any issues, but rolldown-vite is more strict. This PR fixes the tests to help ensure vite-ecosystem-ci can pass against vite-rolldown without having to suppress these errors in Rolldown.

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Latest commit: 2a2343c

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