Add an integration test to verify defer block behavior with input handling during server-side rendering (SSR).
(cherry picked from commit 202fb1a8aa)
PR Close#61056
Previously, with `mergeMap` we did not cancel previous subscriptions to zoneIsStable which caused the application to be stablized before hand.
Closes: #50562
PR Close#50573
This commit updates the platform-server integration tests to use the Angular CLI as it makes it easier to add more tests and remove the custom webpack setup.
PR Close#49900
