Blazor Router.OnNavigateAsync accept cancel or NavigationManager.ChangingHandler can handle first request

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

I'm using Blazor 8 Interactive Serve to complete a system.

I want redirect user to another page, if some condition meets.

- But Router.OnNavigateAsync cannot cancel previous navigation context, user sometimes see a flash.
- NavigationManager.ChangingHandler can cancel, but it cannot handle first navigation.

current workaround is a mix of
1. Set a mask flag to hide display
2. Try redirect in OnInitializedAsync, or clear flag
3. NavigationManager.ChaningHandler
4. Clear flag in OnLocationChanged

### Describe the solution you'd like

Expect a one-shot centralize solution

### Additional context

_No response_