Finalise validation logic for staging and processed tables

[DanielPerezJensen]

Description:

Complete and finalize the validation logic to ensure data integrity and correctness in both the staging and processed tables.

Acceptance Criteria:

• Validation rules are clearly defined and documented for both staging and processed tables
• All necessary validation checks are implemented in the data pipeline
• Validation logic passes all relevant test cases
• Any errors or validation failures are logged for review

[DanielPerezJensen]

https://pandera.readthedocs.io/en/latest/polars.html