Defer committing visible until transition ready

So some logic depend on ActivityRecord#isVisible() won't be called
earlier before transition ready that may delay the animation.
Such as updateFocusedWindow in activityPaused and
updateSystemBarAttributes when starting window performs relayout.

Skip the assertion pipAppWindowAlwaysVisible for "swipe up and
fade in pip" because either "always visible" or "visible->invisible
->visible" is fine for internal state. The visual appearance is
still asserted by layer visibility.

Bug: 260059642
Test: TransitionTests
Test: OpenAppMicrobenchmark with shell transition.

Change-Id: I294a40cfb43ede763f3c91204ae1d7f2d8ff8035