NavManager suppressLocationChanged option

[zbecknell]

Summary of the changes

• Adds an option to suppress the LocationChanged event when navigating with NavigationManager.

Addresses #25767.

This is just an example implementation. The real thing would wait on the results from #25752 to use a new NavigationOptions object if that's the result.

Could using this option cause unexpected behavior? Perhaps... but it's completely opt-in. Someone using this would know what particular problem they're trying to solve. I hope the possibility of side-effects doesn't stop this being a viable option, as applying workarounds to get to this outcome are all sub-optimal.

(Note: I know there are tests failing, but since this is an example PR that is waiting for #25752, I'm not going to cloud up the file changes with fixing test objects that will need to be re-worked when the real PR comes about later.)

[zbecknell]

Fixing the build issues -- I didn't build locally since this was a quick example.

[SteveSandersonMS]

I'll close this since the original requirement was addressed in a different way in #25767, and we'd rather not make NavigationManager harder to understand by adding extra cases where it doesn't behave as normal. Hope that's OK!