fix: adds loader in the thankyou card while response submission

[gupta-piyush19]

What does this PR do?

adds loader in the thankyou card while response submission

Fixes
https://github.com/formbricks/internal/issues/111

How should this be tested?

• Fill a survey quickly and see the thankyou card will display only after the successful response submission

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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[github-actions]

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

[jobenjada]

changed the logic cause it showed media even though it was loading and was a bit tangled