Remove order discount code filter, add index in

PR Overview

This PR will address the following Issue/Feature: #80

This PR will result in the following new package version:

This will merge into a v.12.0 branch that @fivetran-catfritz is working on.

Please provide the finalized CHANGELOG entry which details the relevant changes included in this PR:

🪲 Bug Fixes 🪛

Removed the index filter in stg_shopify__order_discount_code, as we were erroneously filtering out multiple discounts for an order since index is meant to pair with order_id as the unique identifier for this source. PR #80
Added index as a field in stg_shopify__order_discount_code, as it is part of the primary key. PR #80
📝 Documentation Updates 📝
Added index documentation to our src_shopify.yml and stg_shopify.yml. PR #80
Updated the unique_combination_of_columns test to correctly check on index with order_id and source_relation. PR #80

🔧 Under the Hood 🔩

Updated the pull request templates. PR #80

PR Checklist

Basic Validation

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[x] dbt run -–full-refresh && dbt test
[NA] dbt run (if incremental models are present)

Before marking this PR as "ready for review" the following have been applied:

[x] The appropriate issue has been linked, tagged, and properly assigned
[x] All necessary documentation and version upgrades have been applied
[Catherine will regenerate before release] docs were regenerated (unless this PR does not include any code or yml updates)
[x] BuildKite integration tests are passing
[x] Detailed validation steps have been provided below

Detailed Validation

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Added index=2 and index=3 rows to order_discount_code.csv to ensure additional indices were brought in, as well as test and see if the new uniqueness test passed.

fivetran / dbt_shopify_source