Merge topic 'FindGTest-config-mode'

2327b4330c FindGTest: Added support for CONFIG mode
6d45f951ed FindGTest: Minor whitespace change, moved an include upwards
98d5f033ed FindGTest: Ensure target names follow upstream GTest
585cc7c930 ci: install gmock in the Fedora 31 image

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !5404