fix: Pass only supported properties of account to CreateAccount

[gdnmhr]

What does this PR do?

This PR removes unsupported properties from the accounts object upon signup with an external provider. These unsupported properties cause sign-ups to fail for example with Keycloak.

Fixes #2444

How should this be tested?

1. Setup a Keycloak server
2. Add the provider to the Formbricks config
3. Try to create a user with and without the patch

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
• First PR at Formbricks? Please sign the CLA! Without it we wont be able to merge it 🙏

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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[github-actions]

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

[ShubhamPalriwala]

Thanks a lot! This works nicely! 🚀 I refactored the code a bit so that since we also had our own ZAccountInput & TAccountInput zod types for easier handling. Hence I think we should use that so that we do not have to modify the fields at multiple places if in case we want to later.

Thanks a lot for the foundation of this, I'll commit my changes to your PR itself and let me know if you have any questions/feedback/ideas to improve on them. 🤞🏼