fix: add ecs provider in default chain by default and disable by envi…

[PanPanZou]

…ronment variable

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.21429% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.44%. Comparing base (7df2aa2) to head (92d1768).

Files with missing lines	Patch %	Lines
aliyun-net-credentials/Client.cs	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   95.37%   95.44%   +0.06%     
==========================================
  Files          66       66              
  Lines        5454     5489      +35     
  Branches      234      236       +2     
==========================================
+ Hits         5202     5239      +37     
+ Misses        204      202       -2     
  Partials       48       48              

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