test(lib-storage): example of how to mock requests for MPU

[kuhe]

Issue

Internal JS-6197

Description

Adds request/response mapping validation tests for S3 Transfer Manager to ensure all required fields are properly copied between PutObject and multipart upload operations, to be compliant with the specification.

• Captures wire logs from 6MB upload using 4 requests (CreateMultipartUpload → 2x UploadPart → CompleteMultipartUpload) and validates that CompleteMultipartUpload response fields are properly mapped to Upload.done() output.
• Validates that PutObject response fields for small files are correctly mapped to Upload.done() output

Testing

Locally

dev-dsk-smilkuri-1a-17aece6b % yarn test:integration

 RUN  v3.2.4 /local/home/smilkuri/aws-sdk-js-v3/lib/lib-storage

 ✓ src/lib-storage.integ.spec.ts (2 tests) 204ms
   ✓ lib storage integration test > verifies CompleteMultipartUpload response is properly mapped to Upload response for large files 195ms
   ✓ lib storage integration test > verifies PutObject response is properly mapped to Upload response for small files 7ms

 Test Files  1 passed (1)
      Tests  2 passed (2)
   Start at  15:43:56
   Duration  1.29s (transform 525ms, setup 0ms, collect 763ms, tests 204ms, environment 0ms, prepare 119ms)