feat: rate limit per user per env sync user identification endpoint

[ShubhamPalriwala]

What does this PR do?

Rate Limit Per User Per Environment to 5 per minute avoid spam sync calls from an end user~

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! 🙏

[review-agent-prime]

apps/web/middleware.ts

Consider using destructuring assignment when accessing properties of the request.nextUrl object. This will make the code more readable and easier to maintain.
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Checkout the fix

    const { pathname } = request.nextUrl;
    if (isWebAppRoute(pathname) && !token) {
      ...
    }
    if (loginRoute(pathname)) {
      ...
    }
    // and so on for the rest of the code

git fetch origin && git checkout -b ReviewBot/Impro-otmnd9u origin/ReviewBot/Impro-otmnd9u

Consider using template literals instead of the plus operator for string concatenation. This will make the code more readable and easier to understand.
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Checkout the fix

    await syncUserIdentificationLimiter.check(`${environmentId}-${userId}`);

git fetch origin && git checkout -b ReviewBot/Impro-bfwkiub origin/ReviewBot/Impro-bfwkiub

[mattinannt]

@ShubhamPalriwala thank you for adding this additional rate limiter 💪 I hope this makes it less likely that the user identification get's used in the wrong way 😊