🧹 Code Health: Remove unused getIgnoreDirs function and associated dead code

[akutuva21]

🎯 What: Removed unused code from scripts/generate-manifest.js:

• getIgnoreDirs function
• isIgnoredDir function
• DEFAULT_IGNORE_DIRS constant

💡 Why: These elements were dead code and completely unused within the file. Removing them reduces clutter and improves readability and maintainability for future developers.

✅ Verification:

• Used git diff to ensure only the unused code was removed.
• Ran node --test to ensure no existing functionality was broken (existing test failures are known issues unrelated to this change).
• Checked for external usages across the repository.

✨ Result: A cleaner generate-manifest.js file with 24 fewer lines of dead code.

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PR created automatically by Jules for task 13203728183734872069 started by @akutuva21

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