D27899: [wayland] Simplify output handling

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REVISION SUMMARY
  Instead of changing lifespan of kwayland objects we can just call
  create() and delete() on it which affects the lifespan of the underlying
  resource, but not the kwayland wrapper.
  
  This gets rid of some duplicate syncing.

TEST PLAN
  Ran WAYLAND_DEBUG=1
  plugged in and removed a monitor
  output showed wl_output and xdg_output being handled correctly

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D27899

AFFECTED FILES
  abstract_wayland_output.cpp
  abstract_wayland_output.h

To: davidedmundson, #kwin
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