Add initializeBucketCapacity to seed empty-bucket metrics

[delthas]

Context

Bucket quota metrics live in the __infostore collection, keyed bucket_<name>_<creationTimestamp>, and are written today only by the s3utils count-items cron. A freshly created bucket — or a quota enabled on an empty bucket — has no metric document until the next cron run (up to 24h), so CloudServer's bucket-quota check finds nothing in Scuba and fails open (ARTESCA-17063).

MongoClientInterface already touches __infostore internally (writeUUIDIfNotExists), so this is a natural home for the write.

Change

• Add MongoClientInterface.initializeBucketCapacity(bucketName, creationDate, log, cb) — idempotently inserts a zero-value bucket metric document via updateOne({_id}, {$setOnInsert: zeroDoc}, {upsert: true}). An existing document (e.g. one written by count-items with real values) is never overwritten.
  • _id = bucket_<name>_<new Date(creationDate).getTime()>.
  • Document shape matches what count-items produces / Scuba reads: measuredOn plus all-zero usedCapacity and objectCount, built from the module-level emptyBucketCapacityMetrics constant.
• Expose it through MetadataWrapper with a capability guard (no-op for non-mongodb backends, matching the existing getUUID/countItems pattern).

The consumer is CloudServer (CLDSRV-949, scality/cloudserver#6221), which calls this on createBucket and on bucketUpdateQuota of a verifiably-empty bucket.

Tests

Unit tests (MongoClientInterface.spec.js, real mongodb-memory-server): inserts a zero document and reads it back; confirms an existing document is not overwritten (idempotent); returns InternalError on update failure.

Issue: ARSN-610

[bert-e]

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[bert-e]

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[codecov]

Codecov Report

❌ Patch coverage is 64.63415% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.70%. Comparing base (ff0aae1) to head (4fcedbc).
⚠️ Report is 9 commits behind head on development/8.5.

Files with missing lines	Patch %	Lines
lib/storage/metadata/MetadataWrapper.js	58.46%	27 Missing ⚠️
...orage/metadata/mongoclient/MongoClientInterface.ts	88.23%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           development/8.5    #2666   +/-   ##
================================================
  Coverage            74.70%   74.70%           
================================================
  Files                  229      229           
  Lines                18682    18698   +16     
  Branches              3876     3909   +33     
================================================
+ Hits                 13956    13969   +13     
- Misses                4721     4724    +3     
  Partials                 5        5           

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