Adopt Remix v2_errorBoundary future flag

[wizardlyhel]

How to test

• Go to http://localhost:3000/collections/freestylesda, you'll see we have lost this collection
• Go to http://localhost:3000/products/shopify-aurorasd, you'll see we have lost this product
• Go to http://localhost:3000/journal/our-storysda, you'll see we have lost this page (Generic route 404 error)
• Run project locally and throw an error anywhere, you'll see Something’s wrong here

Checklist

• I've read the Contributing Guidelines
• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've added a changeset if this PR contains user-facing or noteworthy changes
• I've added tests to cover my changes
• I've added or updated the documentation