feat(components): more robust empty state for "truly" empty DataList

[chris-at-jobber]

Motivations

For cases where the DataList is truly empty, we should have a more engaging empty state. We've tested a pattern that has proven more effective for this use case, so we should bake it into the DataList as a sensible default.

This is my first stab, primarily to gather feedback on approach and solicit ideas from engineers.

Changes

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Security

Testing

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