Implement a no sync rule (#7216)

* implement a no sync rule

* fix linting disable

* fix unused imports

* exclude more testing

* clean up fs usage

* clean up more fs usage

* remove duplicate of code

* fix compile errors

extensions/notebook/src/common/utils.ts

@@ -188,3 +188,12 @@ export function getHostAndPortFromEndpoint(endpoint: string): HostAndIp {
 		port: undefined
 	};
 }
+
+export async function exists(path: string): Promise<boolean> {
+	try {
+		await fs.access(path);
+		return true;
+	} catch (e) {
+		return false;
+	}
+}