fix: route context being undefined when navigating to a new route faster than beforeLoad resolves

[jakst]

This is just the unit tests. No fix is implemented. Leaving that to you guys. Interestingly, I couldn't get the bug to reproduce in the solid-js unit test, even though that's where we're having the issue. But the bug reproduces in the react-router unit test.

Fixes #6040

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Command	Status	Duration	Result
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☁️ Nx Cloud last updated this comment at 2025-12-09 09:05:35 UTC

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commit: e854fd7