Added More Unique Graph-Related Questions to Question Bank

[SrijaVuppala295]

🛠️ Fixes Issue

Fixes: #573

👨‍💻 Description

• Added 10 new unique graph-related coding problems to the question bank.
• Updated the questions array in the QuestionBankComponent to include challenges that span a variety of graph topics such as shortest path algorithms, cycle detection, graph traversal, and graph properties.
• The added problems cover different difficulty levels: Easy, Medium, and Hard.
• Ensured that all new questions are related to graph algorithms and are from credible sources such as GeeksforGeeks.
• Enhanced the existing filtering logic to allow users to filter by difficulty level and search by keyword across both question titles and descriptions.

📄 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)
• [x] Documentation update (adds or updates related documentation)

📷 Screenshots/GIFs (if any)

https://github.com/user-attachments/assets/cfb55a94-4b7a-4bc9-a3d0-368c71740701

✅ Checklist

• [x] I am a participant of GSSoC-ext.
• [x] I have followed the contribution guidelines of this project.
• [x] I have viewed deployment of my code.
• [x] My changes generate no new warnings.
• [x] I have made this change from my own.
• [x] I have taken help from some online resources.
• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own code.
• [x] I have added documentation to explain my changes.

🤝 GSSoC Participation

• [x] This PR is submitted under the GSSoC program.
• [x] I have taken prior approval for this feature/fix.

[github-actions[bot]]

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[github-actions[bot]]

🎉🎉 Thank you for your contribution! Your PR #579 has been merged! 🎉🎉

[SrijaVuppala295]

@sakeel-103 , please add level 2 !!!