[Bug] Description from schema.yml is not used for materialized view for BigQuery.

[KevinCharette]

Is this a new bug in dbt-bigquery?

• I believe this is a new bug in dbt-bigquery
• I have searched the existing issues, and I could not find an existing issue for this bug

Current Behavior

The description field in the schema.yml is not used to update the table description in BigQuery. The description of the table in BigQuery is left to empty.

Interestingly, adding the description in the sql model is working.

{{
    config(
        materialized='materialized_view',
        description='Super description'
   )
}}

Expected Behavior

The table description in the schema.yml should be pushed to and updated in BigQuery

Steps To Reproduce

1. Create a sql model using materialized='materialized_view' as option.
2. Add a schema.yml with a description
3. run dbt run -s your_model
4. Notice that the description in left blank in BigQuery

Relevant log output

No response

Environment

- OS:14.6.1 (23G93)
- Python:3.11.1
- dbt-core: 1.8.0
- dbt-bigquery: 1.8.0

Additional Context

Quick investigation:
It looks like the issue is coming from here

The description coming from the schema.yml is under relation_config.description but the code is using relation_config.config.extra.get(option)

When I inspect relation_config.config.extra I only see the description field that is provided in the SQL model file using something like this:

{{
    config(
        materialized='materialized_view',
        description='Super description'
   )
}}