test(client-sqs): validate request/response content-type in a queue

[trivikr]

Issue

• Noticed while examining e2e test output in JS-6477
• Alternative to test(client-sqs): check for content-type in input and output #7656

Description

Validates request/response content-type in a 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.
Also creates a

$ client-sqs> yarn test:e2e test/SQS.e2e.spec.ts
...
 Test Files  1 passed (1)
      Tests  2 passed (2)
   Start at  04:10:07
   Duration  753ms (transform 99ms, setup 0ms, collect 167ms, tests 319ms, environment 0ms, prepare 81ms)

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