Dynamically handle creative_history.url_tags as a json or string in BQ

[fivetran-jamie]

PR Overview

This PR will address the following Issue/Feature:
#42
fivetran/dbt_facebook_ads#28
#39

Submission Checklist

Submitter:

• Alignment meeting with the reviewer
• Provide validation details:

  • Validation Steps:

    • Transformation Validation tests pass (will share schema I ran this on in Height):
      
    • BK is passing - this shouldn't affect the other warehouses at all

  • Testing Instructions: I will provide schemas to run this on (with a JSON or STRING version of the field) in Height

    • Running the prod version of facebook_ads on a schema with a JSON field:
      
    • Running the dev version of facebook_ads (reliant on this facebook_ads_source branch) on a schema with a JSON field:
      
    • Running the prod version of facebook_ads on a schema with a STRING field:
      
    • Running the dev version of facebook_ads (reliant on this facebook_ads_source branch) on a schema with a STRING field:
      

  • Focus Areas: Everything is pretty isolated to the creative_history staging model.

Reviewer:

• Confirm submission requirements are met

Changelog

• Draft after PR approval - somewhat drafted already but will confirm later

[fivetran-reneeli]

Looks good with just 1 minor suggestion! Great work on the dynamic logic!

[fivetran-joemarkiewicz]

This PR looks good! Just one clarifying question before approval.

[fivetran-joemarkiewicz]

LGTM