test(client-s3): use chunk size of 8 KB

[trivikr]

Issue

Internal JS-5678

Description

Changes chunk size in E2E tests to 8 KB.

From S3 documentation

The chunk size must be at least 8 KB. We recommend a chunk size of a least 64 KB for better performance. This chunk size applies to all chunks except the last one. The last chunk you send can be smaller than 8 KB. If your payload is small and can fit into one chunk, then it can be smaller than the 8 KB.

Testing

Before

$ client-s3> yarn test:e2e
...
 ❯ test/e2e/S3.e2e.spec.ts (8) 1905ms
   ❯ @aws-sdk/client-s3 (8) 1904ms
     ❯ PutObject (1)
       × should succeed with Node.js readable stream body
...
 FAIL  test/e2e/S3.e2e.spec.ts > @aws-sdk/client-s3 > PutObject > should succeed with Node.js readable stream body
InvalidChunkSizeError: Only the last chunk is allowed to have a size less than 8192 bytes
...
Test Files  1 failed (1)
     Tests  1 failed | 7 passed (8)

After

$ client-s3> yarn test:e2e
...
 Test Files  1 passed (1)
      Tests  8 passed (8)

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