Use single threaded tests for redis worker

Author: ericallam

internal-packages/redis-worker/vitest.config.ts

@@ -4,5 +4,11 @@ export default defineConfig({
   test: {
     include: ["**/*.test.ts"],
     globals: true,
+    fileParallelism: false,
+    poolOptions: {
+      threads: {
+        singleThread: true,
+      },
+    },
   },
 });