SystemTools: use CopyFile on Windows

Tested on my Windows 10 machine

Copied a 2 046 749 KB file 10 times with and without optimization

PS C:\projects\experiments> cmake -P copy_speed_test.cmake
Start time: 2025-02-10 17:17:50
End time: 2025-02-10 17:18:24

PS C:\projects\experiments> C:/projects/cmake/build/bin/Release/cmake.exe -P copy_speed_test.cmake
Start time: 2025-02-10 17:19:00
End time: 2025-02-10 17:19:16

Test script:

# C:/projects/cmake/build/bin/Release/cmake.exe -P copy_speed_test.cmake
# cmake -P copy_speed_test.cmake


# get time before copy (windows way)

execute_process(
    COMMAND "powershell" "-Command" "(Get-Date).ToString('yyyy-MM-dd HH:mm:ss')"
    OUTPUT_VARIABLE start_time
    OUTPUT_STRIP_TRAILING_WHITESPACE
)

file(COPY_FILE ./InstallSkyMP-349d526-1.bin ./InstallSkyMP-349d526-1-copy.bin)
file(COPY_FILE ./InstallSkyMP-349d526-1.bin ./InstallSkyMP-349d526-1-copy-2.bin)
file(COPY_FILE ./InstallSkyMP-349d526-1.bin ./InstallSkyMP-349d526-1-copy-3.bin)
file(COPY_FILE ./InstallSkyMP-349d526-1.bin ./InstallSkyMP-349d526-1-copy-4.bin)
file(COPY_FILE ./InstallSkyMP-349d526-1.bin ./InstallSkyMP-349d526-1-copy-5.bin)
file(COPY_FILE ./InstallSkyMP-349d526-1.bin ./InstallSkyMP-349d526-1-copy-6.bin)
file(COPY_FILE ./InstallSkyMP-349d526-1.bin ./InstallSkyMP-349d526-1-copy-7.bin)
file(COPY_FILE ./InstallSkyMP-349d526-1.bin ./InstallSkyMP-349d526-1-copy-8.bin)
file(COPY_FILE ./InstallSkyMP-349d526-1.bin ./InstallSkyMP-349d526-1-copy-9.bin)
file(COPY_FILE ./InstallSkyMP-349d526-1.bin ./InstallSkyMP-349d526-1-copy-10.bin)

# get time after copy (windows way)

execute_process(
    COMMAND "powershell" "-Command" "(Get-Date).ToString('yyyy-MM-dd HH:mm:ss')"
    OUTPUT_VARIABLE end_time
    OUTPUT_STRIP_TRAILING_WHITESPACE
)

message("Start time: ${start_time}")
message("End time: ${end_time}")

Issue: cmake/cmake#26378
Topic-rename: SystemTools-windows-CopyFile