Try fix csharp macos distribtests (#29156)
Try fix csharp macos distribtests (#29156)

* try fix csharp macos distribtests

* another attempt

* another fix attempt
nicolasnoble/grpc,grpc/grpc,vjpai/grpc,stanley-cheung/grpc,ejona86/grpc,vjpai/grpc,nicolasnoble/grpc,grpc/grpc,ctiller/grpc,jtattermusch/grpc,grpc/grpc,vjpai/grpc,ctiller/grpc,vjpai/grpc,ejona86/grpc,stanley-cheung/grpc,stanley-cheung/grpc,vjpai/grpc,grpc/grpc,jtattermusch/grpc,ctiller/grpc,stanley-cheung/grpc,vjpai/grpc,jtattermusch/grpc,stanley-cheung/grpc,grpc/grpc,nicolasnoble/grpc,jtattermusch/grpc,vjpai/grpc,stanley-cheung/grpc,ejona86/grpc,jtattermusch/grpc,nicolasnoble/grpc,ctiller/grpc,stanley-cheung/grpc,ejona86/grpc,ejona86/grpc,nicolasnoble/grpc,ctiller/grpc,nicolasnoble/grpc,stanley-cheung/grpc,grpc/grpc,ctiller/grpc,jtattermusch/grpc,jtattermusch/grpc,grpc/grpc,grpc/grpc,stanley-cheung/grpc,ejona86/grpc,jtattermusch/grpc,stanley-cheung/grpc,ctiller/grpc,ctiller/grpc,vjpai/grpc,vjpai/grpc,ejona86/grpc,vjpai/grpc,jtattermusch/grpc,grpc/grpc,grpc/grpc,ejona86/grpc,ejona86/grpc,grpc/grpc,ejona86/grpc,ctiller/grpc,jtattermusch/grpc,vjpai/grpc,nicolasnoble/grpc,nicolasnoble/grpc,ejona86/grpc,jtattermusch/grpc,stanley-cheung/grpc,stanley-cheung/grpc,nicolasnoble/grpc,vjpai/grpc,grpc/grpc,ctiller/grpc,ctiller/grpc,nicolasnoble/grpc,nicolasnoble/grpc,ejona86/grpc,ctiller/grpc,nicolasnoble/grpc,jtattermusch/grpc