fix(client-s3): use member xmlname if applicable

[AllanZhengYP]

Issue

Resolves #1814
Resolves #2445

Description

When the payload member has xmlname trait, we need to use the xmlname value for the member rather than the target shape's name.

Cross validate the diffs with the V2 SDK.

Smithy doc: https://awslabs.github.io/smithy/1.0/spec/core/xml-traits.html#xmlname-trait

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[adamthom-amzn]

Do we need protocol test updates to make sure that these don't regress/aren't a problem in future SDKs?

[codecov-commenter]

Codecov Report

Merging #2835 (1bfad22) into main (033a4d8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2835   +/-   ##
=======================================
  Coverage   60.41%   60.42%           
=======================================
  Files         554      554           
  Lines       28885    28886    +1     
  Branches     7072     7072           
=======================================
+ Hits        17452    17453    +1     
  Misses      11433    11433           

Impacted Files	Coverage Δ
...rotocol_tests/aws-restxml/protocols/Aws_restXml.ts	62.89% <100.00%> (+0.01%)	⬆️

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[AllanZhengYP]

Thank you @adamthom-amzn,

I find the xml validator was incorrect as it doesn't validate the outmost node name:

aws-sdk-js-v3/protocol_tests/aws-restxml/tests/functional/restxml.spec.ts

Line 1451 in 28336f5

const unequalParts: any = compareEquivalentXmlBodies(bodyString, r.body.toString());

I will put the fix in a separate PR.

[github-actions]

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