Fix intellisense and launch when using multi config generators in presets

[xisui-MSFT]

This change addresses item #2099

Using CMAKE_CONFIGURATION_TYPES to determine if a multi config generator is used.

When a multi config generator is used, the actual "build type" is determined by --config argument in cmake --build command, or configuration field in build presets. Therefore use it as the "build type" or "configuration" when using multi config generators, and update code model when switching build presets.