refactor build freshness checks to return list

[johannkm]

For consistency with build_column_schema_change_checks

[johannkm]

• #21567 👈
• master

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[github-actions[bot]]

Deploy preview for dagster-docs ready!

Preview available at https://dagster-docs-58owbwttm-elementl.vercel.app https://johann-05-01-refactor-build-freshness-checks-to-return-list.dagster.dagster-docs.io

Direct link to changed pages:

• https://dagster-docs-58owbwttm-elementl.vercel.app https://johann-05-01-refactor-build-freshness-checks-to-return-list.dagster.dagster-docs.io/concepts/assets/asset-checks/checking-for-data-freshness
• https://dagster-docs-58owbwttm-elementl.vercel.app https://johann-05-01-refactor-build-freshness-checks-to-return-list.dagster.dagster-docs.io/concepts/assets/software-defined-assets
• https://dagster-docs-58owbwttm-elementl.vercel.app https://johann-05-01-refactor-build-freshness-checks-to-return-list.dagster.dagster-docs.io/dagster-plus/deployment/agents
• https://dagster-docs-58owbwttm-elementl.vercel.app https://johann-05-01-refactor-build-freshness-checks-to-return-list.dagster.dagster-docs.io/guides/dagster/enriching-with-software-defined-assets