add singleflight for DescribeInstanceTypes

[l1b0k]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 27.54%. Comparing base (94795f0) to head (89414ed).

Files	Patch %	Lines
pkg/aliyun/client/limit.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #659      +/-   ##
==========================================
- Coverage   27.60%   27.54%   -0.06%     
==========================================
  Files          71       71              
  Lines        7879     7884       +5     
==========================================
- Hits         2175     2172       -3     
- Misses       5402     5409       +7     
- Partials      302      303       +1     

Flag	Coverage Δ
unittests	27.54% <0.00%> (-0.06%)	⬇️

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