refactor(router): signal-based RouterLinkActive - #62974

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Hi, thank you for your contribution.
I'm sorry but this is unfortunately too much of a breaking change.

The way inputs are accessed & writen to in exisiting app makes migrating to signal inputs a complex task. We cannot allow ourselves to break existing apps/tests without a proper migration strategy.

Also, having looked beyond that, this implementation broke several unit tests.

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