Add Microsoft.Private.Intellisense.9.0.0-preview-20240916.1 and delete 8.0.0-preview-20230918.1#1036

MichaelSimons merged 2 commits intodotnet:maindotnet/source-build-reference-packages:mainfrom

carlossanlop:IntellisenseNuGetUpdatecarlossanlop/source-build-reference-packages:IntellisenseNuGetUpdateCopy head branch name to clipboard