Set 'watchcreations' and 'watchdefault' options to true

Also modify unit tests to be more resilient to various
other tests automatically having their pages being
watched.

Co-authored-by: Bartosz Dziewoński <matma.rex@gmail.com>
Co-authored-by: Brian Wolff <bawolff+wn@gmail.com>
Bug: 45020
Change-Id: I458783f02813ff023b2d142b57b44e5ec3ba30b9