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MSVC: Do not add /W3 to CMAKE_<LANG>_FLAGS by default

Brad King requested to merge brad.king/cmake:msvc-warning-flags into master

We do not add default warning flags on other compilers, and having a warning flag in the default flags makes it hard for projects to customize the warning level. They need to use string processing to remove /W3 from CMAKE_{C,CXX}_FLAGS. Therefore we should drop it.

However, projects may be using string processing to replace /W3 with another flag, so we cannot simply drop it. Add a policy to drop it in a compatible way.

Fixes: #18317 (closed)

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