Move currentBatch into createRouterAct

Author: unstubbable

test/lib/e2e-utils/router-act.ts

@@ -19,8 +19,6 @@ type PendingRSCRequest = {
   didProcess: boolean
 }
 
-let currentBatch: Batch | null = null
-
 type ExpectedResponseConfig = { includes: string; block?: boolean | 'reject' }
 
 /**
@@ -55,6 +53,8 @@ type ActConfig =
 export function createRouterAct(
   page: Playwright.Page
 ): <T>(scope: () => Promise<T> | T, config?: ActConfig) => Promise<T> {
+  let currentBatch: Batch | null = null
+
   /**
    * Test utility for requests initiated by the Next.js Router, such as
    * prefetches and navigations. Calls the given async function then intercepts