Ability to programmatically perform an "enhanced page refresh"

[MackinnonBuck]

Details to be added later

[SteveSandersonMS]

We need to consider:

• Some extra NavigationOptions flag to navigationManager.NavigateTo that means "do a full page load to the target URL but using progressively-enhanced nav, even if the URL would be matched by the interactive router"
• Doing a "refresh" on the current location (arguably just a special case of the one above)

[MackinnonBuck]

We should decide whether we need to introduce new APIs for this. #49768 makes it possible to do this by calling:

NavigationManager.NavigateTo(NavigationManager.Uri, replace: true);

However, there still might be reasons why we need a new API:

• Simplify the line above to something less verbose, like NavigationManager.EnhancedRefresh()
• Trigger an enhanced page refresh even if an interactive router is present

Maybe we could add a new flag to NavigationOptions like ForceEnhancedNavigation? That will force an enhanced navigation to occur even if an interactive router is present.