* Revert "Revert "Upgrade dotnet SDK 3 for C# build (#22964)" (#26462)" This reverts commit 736d914cfd. * Revert "Exclude csharp from performance test continuous runs. (#26458)" This reverts commit 6744e8f84a. * switch remaining tests to C# buster image * remove C#'s global.json (which requires dotnet SDK 3+) * dotnet SDK3 currently breaks C# package build * regenerate dockerfiles
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