When Angular runs application synchronization automatically, animations
are now guaranteed to be flushed, regardless of whether change detection
was run on any components attached to `ApplicationRef`. This most
frequently affects animations related to component removal where the DOM
element for the component would previously not be removed due to
animations not being flushed

BREAKING CHANGE: Animations are guaranteed to be flushed when Angular
runs automatic change detection or manual calls to `ApplicationRef.tick`.
Prior to this change, animations would not be flushed in some situations
if change detection did not run on any views attached to the
application. This change can affect tests which may rely on the old
behavior, often by making assertions on DOM elements that should have
been removed but weren't because DOM removal is delayed until animations
are flushed.

fixes angular#58075