Fix: Accessing Invalid Route with Loader present fails to show ErrorElement

[amubushar]

Currently, if you access an Invalid Route directly with a Loader present it will fail to display the ErrorElement as mentioned in #12995.

This is due to it continuing to navigate with loader errors and assuming a hydrationError, then when it hydrates subsequently it ends up displaying an empty page instead without falling back to the nearest parent error boundary correctly.

To fix it, we now check for state.errors early & skip navigating to an Invalid Route.

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Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳