Merge topic 'test-ExternalProject' into release-3.30

fe8dc3012e Tests: Fix RunCMake.ExternalProject when git is not available

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Acked-by: Christoph GrĂ¼ninger <foss@grueninger.de>
Merge-request: !9639