Windows: Enable longPathAware for cmake binaries

Most of CMake's file-system accesses already use UNC encoded paths to
avoid the Maximum Path Length Limitation [1].  Enable `longPathAware` in
the manifest so Windows APIs like `GetCurrentDirectoryW` can also exceed
`MAX_PATH`.

[1] https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry#functions-without-max_path-restrictions

Issue: #25936