fix: tiles column should be type text not varchar

[pregnantboy]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes a database schema issue by changing the column type for tiles columns from varchar (via table.string()) to text (via table.text()).

• Changes column type from varchar to text for dynamic tile columns

[datadog-opengovsg]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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[kevinkim-ogp]

lgtm !