fix(ui): Remove blank descriptors

[dstaley]

Description

This PR removes the need to declare blank descriptors to satisfy TypeScript. It also defines the available descriptors in terms of OAUTH_PROVIDERS and WEB3_PROVIDERS instead of hardcoding those descriptors.

Checklist

• npm test runs as expected.
• npm run build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: 44a529f

The changes in this PR will be included in the next version bump.

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