Flip exercise_response + resource_completion to pgTable

[Will-Howard]

Description

• Flips these tables to pgTable
• Sets their id fields to use gen_random_uuid(), and adds a note in DEVELOPMENT_HANDBOOK.md about this

Issue

Fixes #2584, Fixes #2612

Developer checklist

• Front-end code follows Component Accessibility Checklist (for Testing)
• Considered having snapshot tests and/or happy path functional tests
• Considered adding Storybook stories

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch wh-2584-flip-to-pgtable-2026-06

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