tst_qmltest_datavis test is flaky

tst_qmltest_datavis fails randomly in CI.
Test pass, but these is exit code -11 after "cleanupTestCase()", which causes the test to fail. This is reported as a crash to the test metrics.

See crash history at https://testresults.qt.io/grafana/d/3dhio4K7k/fastcheck-ci-test-info?orgId=1&var-testCase=tst_qmltest_datavis&var-testFunction=Error%20parsing%20result,%20test%20crashed.&var-branch=dev&from=now-60d&to=now

Full log:
https://testresults.qt.io/coin/api/log/qt/qtdatavis3d/21a215e7aeaa7db28a88d661c002485be42ee423/LinuxRHEL_8_6x86_64LinuxRHEL_8_6x86_64GCCqtci-linux-RHEL-8.6-x86_64-50-c68e06InstallQt5Dependencies_Sccache_UseConfigure/978d014dbb76191a8361f6ab526b839af2cef5b5/forceRun/test_1692569085/log.txt.gz