Fix storefrontRedirect to strip trailing slashes in querying for redirects

[blittle]

WHY are these changes introduced?

The admin doesn't allow you to save a redirect with a trailing slash, so it should be safe to always strip it

Fixes #2090

WHAT is this pull request doing?

HOW to test your changes?

Post-merge steps

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

[shopify]

Oxygen deployed a preview of your bl-fix-redirect-slashes branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
vite	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 5:10 PM
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 5:10 PM
optimistic-cart-ui	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 5:10 PM
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 5:10 PM
subscriptions	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 5:11 PM
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 5:11 PM

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