Skip some of the obviously failing QCompleter-related tests instead of
blacklisting them.
Skip a test that causes a crash.
This allows to re-enable this test in CMakeLists.txt for Android.
Task-number: QTBUG-87417
Pick-to: 6.3 6.2
Change-Id: Ie7ee708df8ceddf117689e8ac749850ba86e8816
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>