fix: setLocale throws error updating locale cookie from plugin

[BobbieGoede]

🔗 Linked issue

• Not able to set a locale or redirect to specific locale from the server in a middleware or plugin. #2554
• fix: setLocale throwing error when used in plugin #2777

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This should be a more complete fix for #2554 (comment), looks like the main issue was the useCookie usage, which this PR moves out of the function and passes the CookieRef to the utility/internal functions instead.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.