test(client-s3): convert selectObjectContent e2e test into integration test

[smilkuri]

Issue

Amazon S3 Select closed new customer access on July 25, 2024, as announced in the AWS blog post. While existing customers can continue using the service, new AWS accounts cannot access S3 Select functionality.

The existing E2E test for selectObjectContent was failing in local development environment when using new AWS accounts, thus interrupting the local testing workflow.

Description

This PR adds an integration test for the S3 selectObjectContent operation. The test verifies that the request is correctly formed and sent to the expected endpoint with the proper headers and XML body.

Testing

yarn test:integration

 RUN  v3.2.4 /local/home/smilkuri/aws-sdk-js-v3/clients/client-s3

 ✓ test/integ/s3-selectObjectContent.integ.spec.ts (1 test) 25ms
 ✓ test/integ/s3-object-lambda.integ.spec.ts (1 test) 27ms
 ✓ test/integ/authSchemePreference.integ.spec.ts (6 tests) 44ms

 Test Files  3 passed (3)
      Tests  8 passed (8)
   Start at  21:31:54
   Duration  796ms (transform 325ms, setup 0ms, collect 1.32s, tests 97ms, environment 1ms, prepare 342ms)

Additional context

Add any other context about the PR here.

Checklist

• [n/a] If the PR is a feature, add integration tests (*.integ.spec.ts).
• [n/a] If you wrote E2E tests, are they resilient to concurrent I/O?
• [n/a] If adding new public functions, did you add the @public tag and enable doc generation on the package?

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