Merge topic 'execute_process-child-startup-info' into release-3.29

fa8c04b421 Tests/RunCMake/execute_process: Check STARTUPINFOW reserved members
d98df689ab Merge branch 'libuv-win-process-no-extra-stdio'
a590382850 libuv: win/spawn: disable extra-file-descriptor support not needed by CMake

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !9541