Add an integration test for the search api using testcontainers

[jjones287]

Summary

This PR introduces integration testing infrastructure for the Search API using Testcontainers, REST Assured, and an embedded Jetty server.

Key changes:

• Integration Test Infrastructure: Added Testcontainers support for PostgreSQL and OpenSearch
• Search API Testing: Created EncounterExportImagesTest.java with partial coverage for the /api/v3/search/* endpoints
• Dependency Injection Improvements: Refactored Shepherd and CommonConfiguration to accept configurable properties, enabling test database connections and configuration overrides
• OpenSearch Refactoring: Extracted background indexing logic into separate public methods (updateEncounterIndexes(), updatePermissionsIndex()) and exposed initializeClient() to support test setup
• Test Utilities: Added Annotation.setBbox() helper method for easier test data creation
• Developer Experience: Modified pre-commit hook to prefer system uncrustify over bundled version

[jjones287]

Apologies -- I noticed that I accidentally broke the existing tests because I changed the method signature of a method that was being mocked out. That should be fixed now.