ohos: Skip QmlImportsPath test on HarmonyOS

QLibraryInfo derives the default QmlImportsPath from the application
directory, but HarmonyOS stores QML resources outside it.

The application directory is /data/storage/el1/bundle/libs/arm64, while
resources are located under
/data/storage/el1/bundle/entry/resources/resfile.

Skip the test, as is already done on Android.

Fixes: QTBUG-151223
Pick-to: 6.12
Change-Id: If9eef987a7b54bb03aa4be15b736a53966729ac2
Reviewed-by: Liang Qi <liang.qi@qt.io>
Reviewed-by: SanthoshKumar Selvaraj <santhosh.kumar.selvaraj@qt.io>
Reviewed-by: Seokha Ko <seokha.ko@qt.io>