fix: do not sign content-type in s3-request-presigner

[trivikr]

Issue #, if available:
Fixes: #1000

Description of changes:
Do not sign content-type in s3-request-presigner

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[codecov-io]

Codecov Report

Merging #1017 into smithy-codegen will increase coverage by 0.00%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           smithy-codegen    #1017   +/-   ##
===============================================
  Coverage           91.36%   91.36%           
===============================================
  Files                 144      144           
  Lines                2836     2837    +1     
  Branches              501      502    +1     
===============================================
+ Hits                 2591     2592    +1     
  Misses                245      245           

Impacted Files	Coverage Δ
packages/s3-request-presigner/src/index.ts	100.00% <0.00%> (ø)

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[aws-sdk-js-automation]

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• Commit ID: d26a90b
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[AllanZhengYP]

In V2 it looks like the Content-Type not unsigned but moved from header to query string, I'm not able to find the rationale of making this change. However the lower cased content-type is not signable. I looked into other SDKs they don't set content-type to unsigned header either(e.g. Ruby SDK)

[trivikr]

In V2 it looks like the Content-Type not unsigned but moved from header to query string

In v2, "Content-Type" is an unsignable header.
Code: https://github.com/aws/aws-sdk-js/blob/501b590f8d415df53655479381fb63033ea4ebc0/lib/signers/v4.js#L193

[AllanZhengYP]

Looks like PHP is doing it because of the same issue we are facing: aws/aws-sdk-php#1521 (comment)

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