Nav3 migration follow-up: Handle navigate back to ForYou

[claraf3]

Is there an existing issue for this?

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Describe the problem

Figure out how the backStack should handle explicit navigations back to ForYou.

The current implementation would clear all sub stacks. So basically the backStack would be cleared with only a backStack[ForYou] left.

However this feels odd from a user's standpoint. But we also want users to be able to always exit out from ForYou.

Describe the solution

.

Additional context

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