Test and upgrade registry-loader tools against managed OpenSearch

[jordanpadams]

Summary

Test the registry-loader tools against the managed OpenSearch deployment and upgrade as needed to ensure data loading works correctly.

Acceptance Criteria

• Registry-loader tools successfully connect to managed OpenSearch
• PDS4 product loading completes without errors
• Data is correctly indexed in managed OpenSearch
• Any incompatibilities with managed OpenSearch are identified and resolved
• Any required version upgrades or configuration changes are documented

Parent Issue

Part of #517 — Integrate Registry sub-components with Managed OpenSearch

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