cfn: close response bodies on read errors

[fallintoplace]

What

• Close CloudFormation response bodies after failed reads.

Why

• A read error currently leaves the body open.

Implementation

• Defer Close once the HTTP request succeeds.
• Cover failed and partial reads, HTTP errors, and close errors.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.06%. Comparing base (3fa202a) to head (211448a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #645      +/-   ##
==========================================
+ Coverage   82.99%   83.06%   +0.06%     
==========================================
  Files          36       36              
  Lines        1429     1429              
==========================================
+ Hits         1186     1187       +1     
+ Misses        240      239       -1     
  Partials        3        3              

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