fix(level-25): allow adding netpol rule

[rhotertj]

Pull Request

📝 Description

The validation script now allows adding an ingress rule for the frontend pod instead of replacing the one for the "admin-tool".

🎯 Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🎮 New level/challenge
• 🔧 Refactoring (no functional changes)
• ⚡ Performance improvement
• 🎨 UI/UX improvement

🔗 Related Issue

Fixes #(issue number)

📍 Affected Levels/Areas

• World 1 - Basics
• World 2 - Deployments
• World 3 - Networking
• World 4 - Storage
• World 5 - Security
• Game Engine
• Documentation
• Other: ___________

✅ Testing Checklist

• I have tested this locally
• I have run the affected level(s) end-to-end
• Validation scripts pass correctly
• Hints are clear and helpful
• Solution works as intended
• Debrief explains the concept well
• No breaking changes to other levels
• Code follows the project style

🧪 How to Test

📸 Screenshots/Logs (if applicable)

📚 Documentation Updates

• README.md updated (if needed)
• Level documentation updated (if applicable)
• Comments added to complex code
• CHANGELOG.md updated (if significant change)

✨ Additional Notes

🤔 Questions for Reviewers

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Reviewer Checklist

• Code quality is acceptable
• Changes align with K8sQuest's learning objectives
• No security concerns
• Documentation is adequate
• Tested locally and works as described