Unrevert #4424 and #4431 - aws-sdk-go-v2 credentials chain #4438
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Summary
Reintroduces #4424 and #4431, which were reverted in #4432.
Implementation details
See #4424 and #4431 for more implementation details.
Testing
See #4424 for new tests added.
GitHub checks pass.
New tests cover the changes: yes
Description for the changelog
Implement credentials chain for aws-sdk-go-v2.
Licensing
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.