Add ProviderName

[JacksonTian]

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[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 ⚠️

Additional details and impacted files

@@           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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