Allow SSEC bucket decryption in s3 integ tests

[arandito]

Explicitly re-enable SSE-C on S3 integration test buckets after creation so SSE-C tests continue to pass after the April 2026 default bucket-setting rollout.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.25%. Comparing base (1c927ba) to head (cc61351).
⚠️ Report is 4 commits behind head on develop.
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #375      +/-   ##
===========================================
- Coverage    80.61%   80.25%   -0.37%     
===========================================
  Files           16       16              
  Lines         3013     3008       -5     
===========================================
- Hits          2429     2414      -15     
- Misses         584      594      +10     

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