ms-vscode.csharp to ms-dotnettools.csharp (#1424)

Author: devlead

Diff for: .devcontainer/devcontainer.json

@@ -8,7 +8,7 @@
 	},
 	"postCreateCommand": "dotnet restore",
 	"extensions": [
-		"ms-vscode.csharp",
+		"ms-dotnettools.csharp",
 		"ms-vscode.powershell"
 	]
 }

Diff for: .vscode/extensions.json

@@ -3,7 +3,7 @@
     // for the documentation about the extensions.json format
     "recommendations": [
         "ms-vscode.PowerShell",
-        "ms-vscode.csharp",
+        "ms-dotnettools.csharp",
         "ms-vscode-remote.remote-containers"
     ]
 }