fix: correct project details handling for forked repository and Unicode encoding error

[trishanu-init]

Pull Request: Fix Project details handling for forked repositories and Unicode Encoding

Related Issues

Closes #162 and #116

Summary

This PR resolves two key issues in github.py:

1. Repository Filtering & Fork Handling (Bug: Project details of forked repository are not accounted for and skipped from all_repositories because of false positive of forks_count<5 #162)

   • Removed unnecessary filtering of forked repositories with low forks_count.
   • Ensures data is fetched from the parent repository when available.
   • Adds fallback to child repo details if parent data fails.
   • Corrects inaccurate metrics for forked open-source projects.

2. Unicode Encoding Fix ('charmap' codec can't encode characters when caching GitHub data #116)

   • Explicitly writes cache files using UTF-8 encoding.
   • Prevents encoding errors on Windows systems.
   • Maintains consistent handling of Unicode characters across platforms.

Impact

• Accurate and complete repository metadata.
• Improved open-source project evaluation reliability.
• Cross-platform stability and encoding consistency.

Testing

• Verified forked project data accuracy.
• Confirmed UTF-8 cache writing on both Windows and Linux.

[trishanu-init]

resolves #155 as well

[trishanu-init]

evaluating against userId PavitKaur05 (https://github.com/PavitKaur05)

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[trishanu-init]

@sp2hari Can you please review this PR?