ConfigureDialog: Use KPluginMetaData to load KCMs

2 jobs for master in 24 minutes and 18 seconds (queued for 233 minutes and 3 seconds)
Status Name Job ID Coverage
  Build
passed build_clazy_clang_tidy #112257

00:14:18

passed linux kf5-qt5 qt5.15 #112256

00:09:59

11.0%