[release/10.0.1xx] Allow charset to be `unset`#50963

MiYanni merged 2 commits intorelease/10.0.1xxdotnet/sdk:release/10.0.1xxfrom

backport/pr-42266-to-release/10.0.1xxdotnet/sdk:backport/pr-42266-to-release/10.0.1xxCopy head branch name to clipboard