fix(s3-request-presigner): remove x-amz-user-agent header

[AllanZhengYP]

Issue

Resolves: #2383

Description

Remove x-amz-user-agent header when presign the request.

Testing

Unit test & manual test with S3 GET and PUT request

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[codecov-commenter]

Codecov Report

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@@           Coverage Diff           @@
##             main    #2493   +/-   ##
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  Coverage        ?   59.55%           
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  Files           ?      493           
  Lines           ?    26370           
  Branches        ?     6265           
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  Hits            ?    15704           
  Misses          ?    10666           
  Partials        ?        0           

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[alexforsyth]

LGTM

[github-actions]

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