test(client-s3): separate 200 response empty and error

[trivikr]

Issue

Refs: #3874 (comment)

Description

Mocha has some issue with mocking response in S3 tests.

Testing

$ yarn run ts-mocha test/S3.spec.ts                       
yarn run v1.22.19
$ /local/home/trivikr/workspace/aws-sdk-js-v3/node_modules/.bin/ts-mocha test/S3.spec.ts


  endpoint
    ✔ users can override endpoint from client.

  Endpoints from ARN
    Accesspoint ARN
      ✔ should succeed with access point ARN
      ✔ should sign request with region from ARN is useArnRegion is set
    Outposts ARN
      ✔ should succeed with outposts ARN
    Object Lambda ARN
      ✔ should succeed with Object Lambda ARN
      ✔ should update endpoint of WriteGetObjectResponse command

  Throw 200 response
    when response body is empty
      ✔ should throw if CopyObject() return with 200 and empty payload
      ✔ should throw if UploadPartCopy() return with 200 and empty payload
      ✔ should throw if CompleteMultipartUpload() return with 200 and empty payload
    when response body is an error
      ✔ should throw if CopyObject() return with 200 and error preamble
      ✔ should throw if UploadPartCopy() return with 200 and error preamble
      ✔ should throw if CompleteMultipartUpload() return with 200 and error preamble

  regional endpoints
    ✔ should use regional endpoints if region is us-east-1
    ✔ should use global endpoints if region is aws-global


  14 passing (55ms)

Done in 0.79s.

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