[test] Close the http response body

[ahrtr]

Followup of #19302

[ahrtr]

/test pull-etcd-unit-test-386

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.82%. Comparing base (f5973c9) to head (73700e3).
Report is 2 commits behind head on main.

Additional details and impacted files

see 21 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19308      +/-   ##
==========================================
- Coverage   68.85%   68.82%   -0.04%     
==========================================
  Files         420      420              
  Lines       35693    35693              
==========================================
- Hits        24577    24564      -13     
- Misses       9692     9707      +15     
+ Partials     1424     1422       -2     

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