fix(http-server-csharp): avoid duplicate nullable suffixes - #11900

fix(http-server-csharp): avoid duplicate nullable suffixes#11900

Timothee Guerin (timotheeguerin) merged 2 commits into

mainmicrosoft/typespec:mainfrom

sramsey/csharp-duplicate-nullable-suffixesmicrosoft/typespec:sramsey/csharp-duplicate-nullable-suffixesCopy head branch name to clipboard