feat: validate headless config with Yup config schema

[sambrodie]

Description of the Change

Will validate headstartwp.config.server.js and headstartwp.config.client.js (HeadlessConfig) with Yup. If an error is found, it is caught and logged in the terminal during the build process.

Closes #646

How to test the Change

Add invalid values to a project's headstartwp.config.server.js or headstartwp.config.client.js.

Changelog Entry

Added - Validation with Yup

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

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Name	Status	Preview	Comments	Updated (UTC)
headstarwp	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 6, 2024 9:07pm

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Latest commit: 6612a87

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[github-actions]

📦 Next.js Bundle Analysis for @10up/headstartwp

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This PR introduced no changes to the JavaScript bundle! 🙌