Swap stage with stage_id column in ci_finished_builds ClickHouse table

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What does this MR do and why?

This MR #508077 (closed) resolves by swapping the stage with stage_id column in the ci_finished_builds ClickHouse table. Finally, it ensures the stage_id is added to the CSV export.

TODOs:

• Implement the two migrations
• Cross-check if ClickHouse tests are needed
• Update the CSV exporter

🔧 with at Adfinis

References

• #508077 (closed)

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