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Fix(trello-importer): use sequential order values instead of raw list pos

Fix(trello-importer): use sequential order values instead of raw list pos: a task in bird-critic-1.5-full-300 (Harbor dataset). Normalize Trello list positions into sequential status order values.

The task

Normalize Trello list positions into sequential status order values.

Part of kochsnow/bird-critic-1.5-full-300.