fix : return null for invalid run duration in CI route

[tmdeveloper007]

Summary of What Needs to be Done:
The CI route at src/app/api/metrics/ci/route.ts returns 0 for invalid date data in getRunDurationMinutes. This could be confused with a legitimately fast workflow run. Should return null to indicate invalid data.

Changes that Need to be Made:

• File: src/app/api/metrics/ci/route.ts (lines 46-55)
• Change return type to number | null and return null for invalid data

Impact that it would Provide:

• Distinguishes between invalid data and legitimate fast runs
• Allows calling code to handle invalid data appropriately

[github-actions]

✅ Closed as completed!

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