Use codespace on generation branch (#25662)

Author: isra-fel

.azure-pipelines/sync-tools-folder.yml

@@ -11,6 +11,7 @@ trigger:
   paths:
     include:
       - .azure-pipelines
+      - .devcontainer
       - tools
       - src/lib
       - .ci-config.json

.devcontainer/devcontainer.json

@@ -13,13 +13,13 @@
 		}
 	},
 
-	// Set *default* container specific settings.json values on container create.
-	"settings": {},
-
-	// Add the IDs of extensions you want installed when the container is created.
-	"extensions": [
-		"ms-dotnettools.csharp"
-	],
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-dotnettools.csharp"
+			]
+		}
+	},
 
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [5000, 5001],