Which @angular/* package(s) are relevant/related to the feature request?

router, platform-browser

Description

The withEnabledBlockingInitialNavigation option was designed specifically for use cases involving deferred hydration to prevent UI flickers during initial navigation. However, when used with provideClientHydration, which supports standard hydration, the issue of flickering does not arise. To avoid confusion and misuse, a warning should be displayed in the console when these two configurations are used together, as they are not intended to work in tandem.

Proposed solution

Issue warning when these 2 methods are used togather.