chore(cli-integ): fix a race condition in the resource-pool tests (#32646)

There was a race condition between `take1` and `take2`, and the tests would expect `take1` to always win the race.

Change the test to force `take1` to win.

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: rix0rrr

packages/@aws-cdk-testing/cli-integ/test/resource-pool.test.ts

@@ -8,11 +8,16 @@ const POOL_NAME = 'resource-pool.test';
 test('take and dispose', async () => {
   const pool = ResourcePool.withResources(POOL_NAME, ['a']);
   const take1 = pool.take();
-  const take2 = pool.take();
 
   let released = false;
 
   const lease1 = await take1;
+
+  // We must start the take2 only after take1 has definitely
+  // succeeded, otherwise we have a race condition if take2 happens to
+  // win the race (we expect take1 to succeed and take2 to wait).
+  const take2 = pool.take();
+
   // awaiting 'take2' would now block but we add an async
   // handler to it to flip a boolean to see when it gets activated.
   void(take2.then(() => released = true));