test(client-sqs): check for content-type in input and output

[trivikr]

Issue

Noticed while examining e2e test output in JS-6477

Description

Checks for content-type in input and output when different protocol is passed.
Also saves time while executing test by listing just one queue.

Testing

Before

Prints lot of debug statements, and doesn't check for content-type used by protocol.

$ client-sqs> yarn test:e2e test/SQS.e2e.spec.ts

 RUN  v3.2.4 /local/home/trivikr/workspace/aws-sdk-js-v3/clients/client-sqs

stdout | test/SQS.e2e.spec.ts > SQS > can make requests with AwsQueryProtocol
200 POST SQSClient ListQueuesCommand
    https://sqs.us-west-2.amazonaws.com/
    >>== Request Headers: {
      "content-type": "application/x-www-form-urlencoded",
      "content-length": "36",
      "x-amz-user-agent": "aws-sdk-js/3.968.0",
      "user-agent": "aws-sdk-js/3.968.0 ua/2.1 os/linux#5.10.247-246.989.amzn2int.x86_64 lang/js md/nodejs#20.19.0 api/sqs#3.968.0 m/E,w,v",
...
 Test Files  1 passed (1)
      Tests  2 passed (2)
   Start at  02:36:01
   Duration  599ms (transform 100ms, setup 0ms, collect 174ms, tests 169ms, environment 0ms, prepare 91ms)

After

Doesn't print debug statements, and checks for content-type used by protocol.

$ client-sqs> yarn test:e2e test/SQS.e2e.spec.ts
...
 Test Files  1 passed (1)
      Tests  2 passed (2)
   Start at  02:33:26
   Duration  593ms (transform 108ms, setup 0ms, collect 174ms, tests 160ms, environment 0ms, prepare 101ms)

---

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[kuhe]

the test should retain this brief assertion of the output JS structure, shallow though it may be

[trivikr]

This will always be true, since it's always an instance of Array (even if QueueUrls is undefined)

Welcome to Node.js v20.19.0.
Type ".help" for more information.
> (undefined ?? []) instanceof Array
true

If there are no queues in the account, QueueUrls is undefined

{
  '$metadata': {
    httpStatusCode: 200,
    requestId: '7652a27f-b8b7-56a0-9887-c39ebdf93168',
    extendedRequestId: undefined,
    cfId: undefined,
    attempts: 1,
    totalRetryDelay: 0
  }
}

[trivikr]

We already have expect.assertions to confirm that assertions inside middleware are called.

I still added check for httpStatusCode in 598e2ed

[kuhe]

Suggested change

	await client.listQueues({ MaxResults: 1 });
	const queues = await client.listQueues({ MaxResults: 1 });
	expect(queues.QueueUrls ?? []).toBeInstanceOf(Array);

[trivikr]

I added check for httpStatusCode in 598e2ed