D8734: use OCS to retrieve Tabs from the KDE store

[Aleix Pol Gonzalez]

apol accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R106 KSysguard

BRANCH
  Plasma/5.8

REVISION DETAIL
  https://phabricator.kde.org/D8734

To: sitter, #plasma, leinir, jriddell, apol
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, 
abetts, sebas, apol, mart