Rachel House

[DOCS] Add template for code snippet under test for DQ schema use case

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- [ ] Description of PR changes above includes a link to [an existing GitHub issue](https://github.com/great-expectations/great_expectations/issues) - [ ] PR title is prefixed with one of: [BUGFIX], [FEATURE], [DOCS], [MAINTENANCE],...

[DOCS] DSB-1009: Add Learn page for GX <> Airflow data pipeline tutorial

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This PR adds a concise page to the Learn docs that links users to the https://github.com/greatexpectationslabs/tutorial-gx-in-the-data-pipeline tutorial repo. * Direct link to Netlify preview page: https://deploy-preview-10534.docs.greatexpectations.io/docs/reference/learn/integrations/airflow_pipeline_tutorial/ I've also done a...