CLDSRV-902: calculate final checksum from parts

[leif-scality]

• calculate final object checksum from parts

[claude]

LGTM

Review by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.26%. Comparing base (93efed1) to head (8754b9a).
✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
lib/api/apiUtils/integrity/crcCombine.js	100.00% <100.00%> (ø)
lib/api/apiUtils/integrity/validateChecksums.js	99.04% <100.00%> (+0.05%)	⬆️

... and 1 file with indirect coverage changes

@@                              Coverage Diff                               @@
##           improvement/CLDSRV-903-prettier-lint-files    #6169      +/-   ##
==============================================================================
+ Coverage                                       85.17%   85.26%   +0.09%     
==============================================================================
  Files                                             207      208       +1     
  Lines                                           13796    13889      +93     
==============================================================================
+ Hits                                            11751    11843      +92     
- Misses                                           2045     2046       +1     

Flag	Coverage Δ
file-ft-tests	68.91% <5.37%> (-0.43%)	⬇️
kmip-ft-tests	28.18% <5.37%> (-0.16%)	⬇️
mongo-v0-ft-tests	70.08% <5.37%> (-0.44%)	⬇️
mongo-v1-ft-tests	70.07% <5.37%> (-0.46%)	⬇️
multiple-backend	36.52% <5.37%> (-0.21%)	⬇️
sur-tests	35.52% <5.37%> (-0.21%)	⬇️
sur-tests-inflights	37.41% <5.37%> (-0.25%)	⬇️
unit	72.02% <100.00%> (+0.18%)	⬆️
utapi-v2-tests	34.65% <5.37%> (-0.33%)	⬇️

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