Generic data tests accept arbitrary configs (#6312)

## What are you changing in this pull request and why?

Closes #6274

## Checklist
- [x] I have reviewed the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.

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-
https://docs-getdbt-com-git-dbeatty-docs-issue-5548-dbt-labs.vercel.app/reference/data-test-configs

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---------

Co-authored-by: Leona B. Campbell <[email protected]>
Co-authored-by: Mirna Wong <[email protected]>

website/docs/reference/data-test-configs.md

@@ -275,3 +275,24 @@ tests:
 ```
 
 </File>
+
+#### Specify custom configurations for generic data tests
+
+Beginning in dbt v1.9, you can use any custom config key to specify custom configurations for data tests. For example, the following specifies the `snowflake_warehouse` custom config that dbt should use when executing the `accepted_values` data test:
+
+```yml
+
+models:
+  - name: my_model
+    columns:
+      - name: color
+        tests:
+          - accepted_values:
+              values: ['blue', 'red']
+              config:
+                severity: warn
+                snowflake_warehouse: my_warehouse
+
+```
+
+Given the config, the data test runs on a different Snowflake virtual warehouse than the one in your default connection to enable better price-performance with a different warehouse size or more granular cost allocation and visibility.