Merge topic 'deprecate-pre-3.10'

84db8506ff Deprecate compatibility with CMake versions older than 3.10
9e3b559b6a Tests: Update cmake_minimum_required versions to 3.10
f4aa34daa7 Tests/RunCMake: Update cmake_minimum_required versions to 3.10
1d38d52995 Tests/RunCMake: Match diagnostic line numbers more robustly
55778f5a16 ExternalProject: Enable all policies in internal scripts

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !9875