Merge topic 'vs-sdk-selection' into release-3.27

89b611ab VS: Select latest Windows SDK even when targeting Windows 8.1 and below
ae97d82e VS: Teach CMAKE_GENERATOR_PLATFORM to support Windows 8.1 SDK selection
15ff8965 VS: Teach CMAKE_GENERATOR_PLATFORM to use Windows 10 SDKs for older versions
bba1a23d VS: Consolidate Windows SDK major version selection dispatch
209973e5 VS: Do not print empty Windows SDK version when none is selected
ec6dd770 Tests: Remove redundant condition in RunCMake.GeneratorPlatform test
4776a584 Help: Add 3.27 release note on VS default SDK selection

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !8697