D23069: Remove disabled TabGroup feature

[Vlad Zahorodnii]

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

REPOSITORY
  R108 KWin

BRANCH
  arcpatch-D23069_2

REVISION DETAIL
  https://phabricator.kde.org/D23069

To: gladhorn, #kwin, zzag
Cc: romangg, graesslin, kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, gennad, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, skadinna, himcesjf, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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