chore: redirect for deletion survey

[Dhruwang]

What does this PR do?

If on formbricks cloud, users will be redirected to deletion survey on account deletion

Fixes 1743

How should this be tested?

Checklist

Required

• Filled out the "How to test" section in this PR
• Read How we Code at Formbricks
• Self-reviewed my own code
• Commented on my code in hard-to-understand bits
• Ran pnpm build
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the Formbricks Docs if changes were necessary

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2 Ignored Deployments

Name	Status	Preview	Comments	Updated (UTC)
formbricks-cloud	⬜️ Ignored (Inspect)	Visit Preview		Feb 12, 2024 10:48am
formbricks-com	⬜️ Ignored (Inspect)	Visit Preview		Feb 12, 2024 10:48am

[github-actions]

Thank you for following the naming conventions for pull request titles! 🙏

[mattinannt]

@Dhruwang thank you very much for adding the deletion survey 😊🚀
I refactored the code a bit to be able to test this properly on localhost and to make the redirect logic a bit easier to read 😊