Add ProviderName

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.14286% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.10%. Comparing base (13a5e3e) to head (728c565).

Files	Patch %	Lines
...k/auth/credentials/default_credentials_provider.go	75.00%	1 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #657 +/- ## ======================================= Coverage 95.09% 95.10% ======================================= Files 56 56 Lines 3242 3288 +46 ======================================= + Hits 3083 3127 +44 - Misses 102 103 +1 - Partials 57 58 +1 ```

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