fix: handle CredentialsProviderError from AWS SDK JS v3

[jamesmbourne]

Resolves #473

Description:

AWS surfaces a CredentialsProviderError when credentials could not be loaded from any providers, SQS Consumer doesn't currently handle this.

Type of change:

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Why is this change required?: Handle error thrown by AWS SDK for JavaScript v3 which should be treated as an authentication failure.

Code changes:

• The isConnectionError function will return true when passed a CredentialsProviderError

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Checklist:

• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.
• [X] I have added tests to cover my changes.
• [X] All new and existing tests passed.

[github-actions[bot]]

CLA Assistant Lite bot CLA CHECK All Contributors have signed the CLA

[jamesmbourne]

I have read the CLA Document and I hereby sign the CLA

[codeclimate[bot]]

Code Climate has analyzed commit 5b4cfea3 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (80% is the threshold).

This pull request will bring the total coverage in the repository to 98.3% (0.0% change).

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