Presets: Search parent directories if source directory has no presets file

Similar to how tools like clang-format work, if the user includes the --presets option on their CMake command line but the project's source directory has no CMakePresets.json or CMakeUserPresets.json file, it would be really convenient if cmake would search recursively the parent directories for CMakeUserPresets.json (but not CMakePresets.json). If you have all your project sources under a common directory, you could put a CMakeUserPresets.json file in that common directory and you could make use of it from any of the projects with no extra effort.

I'm still on the fence about whether to search recursively for a CMakeUserPresets.json file if the project source directory has just a CMakePresets.json file but no CMakeUserPresets.json file in it.

We should not search recursively for a CMakePresets.json file since that should always be provided by the project.