chore: remove httpHeaders from metadata

[trivikr]

Note: This PR will be made ready for review once user agent PR is merged #1775

Issue #, if available:
Fixes: #1491
Depends on: smithy-lang/smithy-typescript#251

Description of changes:
chore: remove httpHeaders from metadata

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[codecov-io]

Codecov Report

Merging #1811 (e43a5d2) into master (de75f7e) will decrease coverage by 0.49%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1811      +/-   ##
==========================================
- Coverage   79.77%   79.28%   -0.50%     
==========================================
  Files         325      367      +42     
  Lines       12087    15116    +3029     
  Branches     2553     3221     +668     
==========================================
+ Hits         9643    11985    +2342     
- Misses       2444     3131     +687     

Impacted Files	Coverage Δ
protocol_tests/aws-json/models/models_0.ts	79.36% <0.00%> (-20.64%)	⬇️
packages/util-user-agent-node/src/index.ts	88.88% <0.00%> (-11.12%)	⬇️
protocol_tests/aws-restjson/models/models_0.ts	89.43% <0.00%> (-10.57%)	⬇️
...rotocol_tests/aws-restxml/protocols/Aws_restXml.ts	64.10% <0.00%> (-2.15%)	⬇️
...ackages/node-http-handler/src/node-http-handler.ts	98.00% <0.00%> (-2.00%)	⬇️
packages/middleware-sdk-sqs/src/send-message.ts	86.66% <0.00%> (-0.84%)	⬇️
protocol_tests/aws-query/protocols/Aws_query.ts	66.34% <0.00%> (-0.38%)	⬇️
...kages/middleware-sdk-sqs/src/send-message-batch.ts	92.30% <0.00%> (-0.29%)	⬇️
...kages/fetch-http-handler/src/fetch-http-handler.ts	9.30% <0.00%> (-0.23%)	⬇️
protocol_tests/aws-ec2/protocols/Aws_ec2.ts	66.93% <0.00%> (-0.01%)	⬇️
... and 188 more

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