feat(manager/nuget): update msbuild-sdks section in global.json (#11707)

lib/manager/nuget/__fixtures__/msbuild-sdk-files/global.json

...t/__fixtures__/msbuild-sdk-files/invalid-json/global.json

...uget/__fixtures__/msbuild-sdk-files/not-nuget/global.json

lib/manager/nuget/extract.spec.ts

lib/manager/nuget/extract.ts

lib/manager/nuget/extract/global-manifest.ts

lib/manager/nuget/index.ts

lib/manager/nuget/types.ts

lib/types/skip-reason.ts