D10929: Implement releasing of client-freed output

[Oleg Chernovskiy]

Kanedias added a task: T7785: PipeWire support in remote access to KWin.

REPOSITORY
  R127 KWayland

REVISION DETAIL
  https://phabricator.kde.org/D10929

To: Kanedias, davidedmundson, graesslin
Cc: #frameworks, michaelh