CLDSRV-965: checksums feature flag

[leif-scality]

• Add checksum toggle
• Enabled by default
• When set to false, checksums are no longer handled (no header is verified, no checksum is computed, no checksum is compared, no checksum is stored)
• Content-MD5 et x-amz-checksum-sha256 not impacted by the flag

[bert-e]

Hello leif-scality,

My role is to assist you with the merge of this
pull request. Please type @bert-e help to get information
on this process, or consult the user documentation.

Available options

name	description	privileged	authored
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/bypass_commit_size	Bypass the check on the size of the changeset TBA	⭐
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name	description	privileged
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Status report is not available.

[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

• the author

• 2 peers

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.36%. Comparing base (8a8ee9b) to head (8218847).
✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
lib/Config.js	80.42% <100.00%> (+0.24%)	⬆️
lib/api/apiUtils/integrity/validateChecksums.js	98.75% <100.00%> (+0.08%)	⬆️
lib/api/apiUtils/object/createAndStoreObject.js	86.41% <100.00%> (+0.16%)	⬆️
lib/api/apiUtils/object/prepareStream.js	100.00% <100.00%> (ø)
lib/api/completeMultipartUpload.js	90.82% <100.00%> (-0.23%)	⬇️
lib/api/initiateMultipartUpload.js	91.57% <100.00%> (+0.04%)	⬆️
lib/api/objectCopy.js	89.74% <100.00%> (+0.34%)	⬆️
lib/api/objectPutCopyPart.js	88.84% <100.00%> (+0.09%)	⬆️
lib/api/objectPutPart.js	89.62% <100.00%> (+0.04%)	⬆️
lib/routes/veeam/utils.js	98.19% <100.00%> (ø)
... and 1 more

@@                 Coverage Diff                 @@
##           development/9.4    #6248      +/-   ##
===================================================
+ Coverage            86.32%   86.36%   +0.03%     
===================================================
  Files                  212      212              
  Lines                14528    14562      +34     
===================================================
+ Hits                 12541    12576      +35     
+ Misses                1987     1986       -1     

Flag	Coverage Δ
checksums-disabled-tests	35.34% <60.86%> (?)
file-ft-tests	70.00% <69.56%> (-0.02%)	⬇️
file-ft-tests-null-compat	70.48% <69.56%> (+0.02%)	⬆️
kmip-ft-tests	28.09% <42.02%> (+0.04%)	⬆️
mongo-v0-ft-tests	71.10% <69.56%> (+0.02%)	⬆️
mongo-v1-ft-tests	71.13% <69.56%> (+0.07%)	⬆️
multiple-backend	36.10% <28.98%> (+0.01%)	⬆️
s3c-ft-tests-v0	65.07% <63.76%> (+0.01%)	⬆️
s3c-ft-tests-v0-null-compat	65.12% <63.76%> (-0.01%)	⬇️
s3c-ft-tests-v1	65.05% <63.76%> (+0.01%)	⬆️
sur-tests	36.47% <42.02%> (-0.01%)	⬇️
sur-tests-inflights	39.28% <63.76%> (+0.08%)	⬆️
unit	73.80% <98.55%> (+0.06%)	⬆️
utapi-v2-tests	35.30% <65.21%> (+0.09%)	⬆️

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