Disable navigation interception if the interactive router gets removed from the page

[MackinnonBuck]

If an interactive router gets dynamically removed, server-side routing doesn't take over again, and each navigation updates the address bar without changing any content on the page.

Disabling navigation interception when the router gets removed would allow server-side routing to work again.

This was prototyped in #50012 as part of an unrelated feature, but that PR got closed in favor of a more narrowly-scoped one.

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[javiercn]

@MackinnonBuck is this still relevant?

[MackinnonBuck]

@javiercn It's still an issue, yes. I implemented a fix in #50564, but we closed it as not a priority for .NET 8.