feat(credential-provider-ini): support credential_source in shared file

[AllanZhengYP]

Description

support credential_source in shared credential file

[JS-2536]

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[codecov-io]

Codecov Report

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@@           Coverage Diff           @@
##             main    #2237   +/-   ##
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  Coverage        ?   61.86%           
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  Files           ?      453           
  Lines           ?    23308           
  Branches        ?     5531           
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  Hits            ?    14420           
  Misses          ?     8888           
  Partials        ?        0           

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 5c30945
• Result: FAILED
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