fix: Fix S3 credential checks

[jonas-hoebenreich]

What does this PR do?

Fixes #2512

How should this be tested?

• Try to configure S3 in an environment that uses IAM Identity Center credential provider
• Check if you can correctly configure S3

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

[vercel]

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[github-actions]

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

[mattinannt]

connected to #2144

@pandeymangg Can you please take a look? :-)

[pandeymangg]

thanks for the PR @jonas-hoebenreich 😊 I just removed the unused environment variables related to AWS sdk, lets merge this 🚀