[dvasilas]

Context (S3C-11459): Allow a deployment to configure multiple KMSs.

---

The deep health check currently reports only the default KMS, keyed by its client type (kmip, aws, fileKms, …). The other configured KMSs are never checked.

This PR runs the existing KMS health check for every configured KMS and reports one entry per KMS, keyed by its providerName.

Example:

    "thales": { "code": 200, "message": "OK", "lastChecked": "2026-10-30T09:12:44.000Z" },
    "local": { "code": 200, "message": "OK" },
    "scality": { "code": 200, "message": "OK" }

KMS health stays informational: a failing KMS fails neither start-up nor readiness, even when every KMS fails. A KMS whose client has no health check reports OK without being contacted; today only the KMIP client has one.

[bert-e]

Hello dvasilas,

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[bert-e]

Waiting for approval

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.68%. Comparing base (4811fc1) to head (45aed63).
✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
lib/kms/wrapper.js	89.28% <100.00%> (+0.76%)	⬆️

... and 2 files with indirect coverage changes

@@                 Coverage Diff                 @@
##           development/9.6    #6347      +/-   ##
===================================================
- Coverage            90.71%   90.68%   -0.03%     
===================================================
  Files                  207      207              
  Lines                38843    38886      +43     
===================================================
+ Hits                 35235    35265      +30     
- Misses                3608     3621      +13     

Flag	Coverage Δ
checksums-disabled-tests	46.10% <56.98%> (+0.06%)	⬆️
file-ft-tests	75.76% <56.98%> (+<0.01%)	⬆️
file-ft-tests-null-compat	76.22% <56.98%> (+0.02%)	⬆️
kmip-ft-tests	43.51% <84.94%> (+0.23%)	⬆️
mongo-v0-ft-tests	76.81% <56.98%> (+0.05%)	⬆️
mongo-v1-ft-tests	76.79% <56.98%> (-0.01%)	⬇️
multiple-backend	44.50% <56.98%> (+0.06%)	⬆️
s3c-ft-tests-v0	71.61% <56.98%> (+0.03%)	⬆️
s3c-ft-tests-v0-null-compat	71.66% <56.98%> (+0.03%)	⬆️
s3c-ft-tests-v1	71.57% <56.98%> (+0.03%)	⬆️
sur-tests	45.00% <56.98%> (+0.04%)	⬆️
sur-tests-inflights	48.39% <56.98%> (+0.03%)	⬆️
unit	80.20% <100.00%> (+0.02%)	⬆️
utapi-v2-tests	45.03% <56.98%> (+0.06%)	⬆️

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