feat: move revalidation interval to a constant

[rotimi-best]

What does this PR do?

In this PR i moved the revalidation interval value that was hardcoded in multiple services now into a constant

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Chore (refactoring code, technical debt, workflow improvements)
• Enhancement (small improvements)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change adds a new database migration
• This change requires a documentation update

How should this be tested?

• Did a general work through of the application to make sure nothing breaks
  Not sure I should do more specific tests

Checklist

• Added a screen recording or screenshots to this PR
• Filled out the "How to test" section in this PR
• Read the contributing guide
• 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
• 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! 🙏

[mattinannt]

💪🙏