Prevent users from deleting the last payment method attached to the org

[carlosmonastyrski]

Description 📣

Disable ability to remove a payment method if a customer only has one payment method on file

Type ✨

• Bug fix
• New feature
• Improvement
• Breaking change
• Documentation

Tests 🛠️

# Here's some code block to paste some code snippets

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[maidul98]

🎉 Snyk checks have passed. No issues have been found so far.

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[greptile-apps]

Greptile Summary

This PR implements a safety mechanism to prevent organizations from deleting their last payment method. The changes span both frontend and backend:

• Frontend: Adds a validation check in PmtMethodsTable that prevents deletion if only one payment method exists, showing an error notification to users
• Backend: Enhances error handling in license-service.ts to properly capture and relay error messages from the license server API when payment method deletion fails

These changes ensure organizations maintain at least one valid payment method for billing continuity.

Confidence score: 5/5

1. This PR is very safe to merge as it adds protective validation without modifying existing behavior
2. The changes are straightforward, well-implemented, and follow defensive programming practices
3. Key areas to review:
   • Error handling in license-service.ts
   • Frontend validation logic in PmtMethodsTable.tsx

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