build: used ts-prune to find unused code

[JoshuaKGoldberg]

What type of PR is this? (check all applicable)

• [ ] 🍕 Feature
• [ ] 🐛 Bug Fix
• [ ] 📝 Documentation Update
• [ ] 🎨 Style
• [ ] 🧑‍💻 Code Refactor
• [ ] 🔥 Performance Improvements
• [ ] ✅ Test
• [x] 🤖 Build
• [ ] 🔁 CI
• [ ] 📦 Chore (Release)
• [ ] ⏩ Revert

Description

Per #432, adds ts-prune and deletes its detected unused code.

Related Tickets & Documents

Fixes #432.

Added tests?

• [ ] 👍 yes
• [x] 🙅 no, because they aren't needed
• [ ] 🙋 no, because I need help

Added to documentation?

• [ ] 📜 README.md
• [ ] 📓 docs.opensauced.pizza
• [ ] 🍕 dev.to/opensauced
• [ ] 📕 storybook
• [x] 🙅 no documentation needed

Are there any post-deployment tasks we need to perform?

Yes, the development.yml tasks should be updated to run this in CI too.

What gif best describes this PR or how it makes you feel?

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[github-actions[bot]]

:tada: This PR is included in version 2.31.0-beta.5 :tada:

The release is available on:

• GitHub release
• ghcr.io container (@beta dist-tag)

Your semantic-release bot :package::rocket:

[mtfoley]

Yo @JoshuaKGoldberg thanks for the PR. Gotta love commits with negative line counts 👍

[github-actions[bot]]

:tada: This PR is included in version 2.31.0 :tada:

The release is available on:

• GitHub release
• ghcr.io container (@latest dist-tag)

Your semantic-release bot :package::rocket: