Move stack to front in-sync with task reparenting

When reparenting a task to another stack have window manager move the
destination stack to the front at the same time it is reparenting the
task if REPARENT_MOVE_STACK_TO_FRONT is set to avoid jank.

Test: manual
Bug: 37299899
Change-Id: I45678e742188a4871f93a11178f7ab2b60c7bcc3