NIAD-3148 - Immunizations outside of consultation are mapped to Observation

[martin-nhs]

What

This PR resolves a bug where an immunization was incorrectly mapped to an Observation due to a SNOMED code mismatch. During debugging, it was identified that the code being processed was a Description ID rather than a Concept ID, which caused the mapping error. To address this, the immunization codes view has been modified to include a join on the Description ID. This update allows for accurate querying and validation, ensuring the correct mapping of immunization data.

Why

More details can be found on the ticket.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist:

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have updated the Changelog with details of my change in the UNRELEASED section if this change will affect end users
• A corresponding change has been made to the Mapping Documentation repository