* Build native assets by default
- #22556
- make `-BuildNative` primarily useful when you want _only_ native assets
- can also build `-Projects` with desktop `msbuild` using `-BuildNative`
- remove `-ForceCoreMsbuild` option
nit: extra `Remove-Item`s caused `MSBuild` function to do redundant work
* !fixup! Get `/bl` options working again
nit: Place SiteExtensions .binlogs correctly wherever script is run from
* !fixup! Remove *.vcxproj from Servers build
- native projects are built implicitly
* !fixup! Remove `-buildNative` from IIS build script
