test(protocol): compare xml payload correctly

[AllanZhengYP]

Issue

Followup to #2835
Related to smithy-lang/smithy-typescript#433

Description

Previously the protocol test won't throw if the xml payload's outmost node name is different. For example, it succeeded if payload is <Hola><name>Phreddy</name></Hola> but expected <Hello><name>Phreddy</name></Hello>. This change fixes it.

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[codecov-commenter]

Codecov Report

Merging #2840 (7fe7ff1) into main (2d14c8b) will not change coverage.
The diff coverage is n/a.

❗ Current head 7fe7ff1 differs from pull request most recent head 4432122. Consider uploading reports for the commit 4432122 to get more accurate results

@@           Coverage Diff           @@
##             main    #2840   +/-   ##
=======================================
  Coverage   60.42%   60.42%           
=======================================
  Files         554      554           
  Lines       28886    28886           
  Branches     7072     7072           
=======================================
  Hits        17453    17453           
  Misses      11433    11433           

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[AllanZhengYP]

Fixed another issue that the client protocol test's test folder is not copied by generate-clients script.

Service test is still blocked, because the import path of the service client is messed up. Will fix it in separate PR

[AllanZhengYP]

Needs smithy-lang/smithy-typescript#438 to be merged to unblock the CI.

[github-actions]

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