Convert sample to .NET 8#291

Draft

allisonchou wants to merge 4 commits intomicrosoft:masterfrom

allisonchou:dev/allichou/TestUpgradeSDK

Commits on Jul 17, 2024

Initial upgrade
allisonchou
committed

Commits on Jul 18, 2024

Resolve build errors
allisonchou
committed

Commits on Jul 26, 2024