Fix company contribution calculation discrepancies in governance data

[Arunodoy18]

• Add company-level aggregation queries using count(distinct e.id) to both kubernetes and shared project_developer_stats.sql
• Prevents double-counting when multiple developers from same company work on same GitHub events
• Ensures consistency between companies table and developer activity dashboards for governance decisions
• Addresses Istio governance data discrepancy where Google showed 12738 vs 12615 contributions in different views
• Fixes potential ranking issues for top 5 company contributions across all CNCF projects

Please make sure that you follow instructions from CONTRIBUTING

Specially:

• Check if all tests pass, see TESTING for deatils.
• Make sure you've added test coverage for new features/metrics.
• Make sure you have updated documentation.
• If you added a new metric, please make sure you have been following instructions about adding new metric.

[Arunodoy18]

I have done the following changes. If anything is needed please do Tell. Thank you.

[lukaszgryglicki]

Looking good at the 1st glance, but I would have to pull that branch and execute on the test database to confirm and only then I can merge and make it default (not speaking about regenerating all projects already existing data) - I can't do this ATM, will do on my next CNCF working. day after the more urgent migration task, so this is added to my backlog.

[Arunodoy18]

Thanks for the update! Sounds good — go ahead with your migration task first. Whenever you get a chance to review it on the test database, I’m here if you need anything from my side.

[Arunodoy18]

Any updates on merging? ThankYou.

[lukaszgryglicki]

As I said, I can do this after migration. This is not done yet.