fix(client): close response body on non-2XX in ExecStream

[michimani]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.85%. Comparing base (426355a) to head (bdacaf6).
⚠️ Report is 14 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #344      +/-   ##
==========================================
+ Coverage   95.39%   95.85%   +0.45%     
==========================================
  Files         101      101              
  Lines        3603     2964     -639     
==========================================
- Hits         3437     2841     -596     
+ Misses        126       83      -43     
  Partials       40       40              

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