[BI-2778] Deprecate additionalinfo usage for level and use obs unit lvl

[HMS17]

Description

Story: BI-2778 - Deprecate additionalinfo usage for level and use obs unit level

Changes to ensure front end display of obs lvl is capitalized.

Dependencies

bi-api: feature/BI-2778

Testing

see bi-api

Checklist:

• I have performed a self-review of my own code
• I have tested my code and ensured it meets the acceptance criteria of the story
• I have commented my code, particularly in hard-to-understand areas
• I have either updated the source of truth or arranged for update with product owner if needed https://breedinginsight.atlassian.net/wiki/spaces/BI/pages/1559953409/Source+of+Truth
• I have run SiteImprove on pages impacted by changes