test: lambda/runtime/api/client package

[maxday]

Description of changes:

add tests for lambda/runtime/api/client package

Target (OCI, Managed Runtime, both):
both

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.39%. Comparing base (338d006) to head (6b29f40).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #527      +/-   ##
============================================
+ Coverage     54.52%   58.39%   +3.86%     
- Complexity      202      220      +18     
============================================
  Files            47       46       -1     
  Lines          1150     1144       -6     
  Branches        149      149              
============================================
+ Hits            627      668      +41     
+ Misses          464      422      -42     
+ Partials         59       54       -5     

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