S3UTILS-241: fix truncated metadata writes for multi-byte UTF-8 object keys

[jonathan-gramain]

Summary

• Fix content-length in httpRequest being set to string character count instead of byte length, causing truncated writes when the body contains multi-byte UTF-8 characters (e.g. object keys with non-ASCII characters)
• Add unit tests for httpRequest (GET and POST with multi-byte UTF-8 body) and putObjectMetadata (success, malformed URL, non-200 response)

Test plan

• yarn test:unit passes
• Verify on a cluster that putObjectMetadata with non-ASCII object keys no longer produces truncated metadata in bucketd

🤖 Generated with Claude Code

[bert-e]

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.92%. Comparing base (2db148e) to head (8813e3c).

Files with missing lines	Patch %	Lines
repairDuplicateVersionsSuite.js	0.00%	5 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##           development/1.17     #400      +/-   ##
====================================================
- Coverage             44.94%   44.92%   -0.03%     
====================================================
  Files                    88       88              
  Lines                  6459     6462       +3     
  Branches               1353     1354       +1     
====================================================
  Hits                   2903     2903              
- Misses                 3510     3513       +3     
  Partials                 46       46              

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[jonathan-gramain]

/approve

[bert-e]

Integration data created

I have created the integration data for the additional destination branches.

• this pull request will merge bugfix/S3UTILS-241-object-repair-writes-truncated-metadata into
  development/1.17
• w/1/bugfix/S3UTILS-241-object-repair-writes-truncated-metadata will be merged into development/1

The following branches will NOT be impacted:

• development/1.13
• development/1.14
• development/1.15
• development/1.16
• development/1.4
• development/1.7

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The following options are set: approve

[jonathan-gramain]

I removed the version bump commit as I am planning on also implementing S3UTILS-242 as an improvement to object repair.

[bert-e]

I have successfully merged the changeset of this pull request
into targetted development branches:

• ✔️ development/1.17

• ✔️ development/1

The following branches have NOT changed:

• development/1.13
• development/1.14
• development/1.15
• development/1.16
• development/1.4
• development/1.7

This pull request did not target the following hotfix branch(es) so they
were left untouched:

• hotfix/1.14.0

Please check the status of the associated issue S3UTILS-241.

Goodbye jonathan-gramain.

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