Remove copy of NeTEx datasets to the varelager private bucket

[vpaturet]

Summary

All consumers of the ror-nisaba-exchange-varelager-* buckets have migrated to the REST API for downloading NeTEx datasets, so the private-bucket copy feature is dead code. This PR removes:

• The copy-dataset-to-private-bucket Camel route and the whitelist filter in NetexImportNotificationQueueRouteBuilder, including the nisaba.netex.publication.internal.{bucket,whitelist} injection
• The blobstore-copy-to-another-bucket route (NisabaExchangeBlobStoreRoute) and AbstractBlobStoreService.copyBlobToAnotherBucket — the removed route was their only consumer
• The TARGET_FILE_HANDLE / TARGET_CONTAINER constants, used only by this feature
• The nisaba.netex.publication.internal.* properties from the Helm configmap and the netex.publication.internal.bucket values for dev/tst/prd
• The feature's documentation in CLAUDE.md

The change is behaviour-neutral for the Kafka event path: the copy step sat between event creation and the Kafka send but only mutated headers that are filtered out of the Kafka message.

Out of scope

The GCS buckets ror-nisaba-exchange-varelager-{dev,test,production} and their IAM bindings are no longer managed by this repo (their Terraform was removed earlier) and must be deleted where infrastructure is managed now.

Testing

• mvn clean verify passes: 11 tests, 0 failures
• helm template renders cleanly with the dev values
• Grep confirms no remaining references to varelager, the whitelist, or the copy plumbing

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud