[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

Removed calls to set observation level info in additionalInfo and replaced calls to get observation level info from additionalInfo with calls to the observation level associated with the observation object.

This should not be merged until after the migration of BI-2779 is merged.

Dependencies

bi-web: feature/BI-2778

Testing

Test areas related to experiments to ensure nothing is broken:

-- Upload experiment
-- Create sub entity dataset
-- View experiment
-- Download top level experiment dataset
-- Download sub entity experiment dataset

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 create/modified unit and/or integration tests to cover this change or tests are not applicable
• 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