deleted onboardog detail once user delete the serviec

[varsha766]

🎯 Purpose

Why is this change needed? (problem it solves or value it adds)

• To delete onboarding detail once user delete kyc service.

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📝 Changes

• Brief list of main updates
• Added logic to delete the related onboarding entry when the KYC service is removed.
• Used the onboarding model directly instead of importing the full module to avoid a circular dependency issue.
• Ensured safe conditional checks before deleting onboarding data.

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🔄 Type

• 🚀 Feature
• 🐛 Fix
• 📝 Docs
• ♻️ Refactor
• ✅ Tests
• 🔧 Config / CI

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🧪 Testing

How did you test this? (unit/integration/manual)

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✅ Checklist

• Code follows Hypermine standards
• Tests/docs updated if needed
• Verified locally