Set analyzers `global_level` to `-99`.
Set analyzers `global_level` to `-99`.

This allows MSBuild SDKs that extend `Microsoft.NET.Sdk` to inject config files between Roslyn's config files and arbitrary files provided by the user or NuGet packages.
dotnet/roslyn,KevinRansom/roslyn,KevinRansom/roslyn,CyrusNajmabadi/roslyn,mavasani/roslyn,dotnet/roslyn,shyamnamboodiripad/roslyn,weltkante/roslyn,bartdesmet/roslyn,jasonmalinowski/roslyn,sharwell/roslyn,mavasani/roslyn,CyrusNajmabadi/roslyn,bartdesmet/roslyn,diryboy/roslyn,diryboy/roslyn,jasonmalinowski/roslyn,weltkante/roslyn,sharwell/roslyn,KevinRansom/roslyn,dotnet/roslyn,mavasani/roslyn,sharwell/roslyn,jasonmalinowski/roslyn,diryboy/roslyn,shyamnamboodiripad/roslyn,shyamnamboodiripad/roslyn,bartdesmet/roslyn,weltkante/roslyn,CyrusNajmabadi/roslyn