[Debt] Remove sanitize string function

[esizer]

🤖 Resolves #11370

👋 Introduction

Removes our sanitizeString function in favour of adding characters to the firewall allow list.

🧪 Testing

1. Build app pnpm run dev:fresh
2. Confirm you can submit forms with text inputs

[vd1992]

Hm, I think the important thing to check here is whether the Narrow No-Break Space was adjusted for in the firewall. Only safe to remove the function if it is the case 😆

[petertgiles]

whether the Narrow No-Break Space was adjusted for in the firewall

Try it out! Graphiql is down in prod, unfortunately, but you could still try it with browser edit and resend or postman.