test : add unit tests for scoreOpenIssuesCount function

[tmdeveloper007]

Summary of What Needs to be Done:
Add unit tests for the scoreOpenIssuesCount function in src/lib/repo-health.ts. Tests must use vitest framework and import actual source code.

Changes that Need to be Made:

• Create test using vitest describe/it/expect
• Test 0 issues returns 15 points
• Test 20+ issues returns 0 points
• Test 1-19 issues scales linearly

Impact that it would Provide:

• Ensures issue count scoring is correct
• Validates penalty for open issues

[Harsh-Codes-77]

/assign

[github-actions]

✅ Closed as completed!

If DevTrack has been useful, a ⭐ star on the repo helps the project grow and reach more developers.