chore: import upstream snapshot with attribution

packages/redis-worker/src/utils.ts

@@ -0,0 +1,10 @@
+/**
+ * Check if an error is an AbortError.
+ *
+ * This handles both:
+ * - Custom abort errors created with `new Error("AbortError")` (sets .message)
+ * - Native Node.js AbortError from timers/promises (sets .name)
+ */
+export function isAbortError(error: unknown): boolean {
+  return error instanceof Error && (error.name === "AbortError" || error.message === "AbortError");
+}