issue_triage.py should assign issues with area/platform to a special card

[jlewi]

Currently the issue_triage.py adds all issues needing triage to the card "TODO".

However, we have created a card for issues that have been assigned to area owner. We should automatically move issues with an area or platform issue to "Assigned to Area Owners" card.

This is because one of the ways we will scale triaging is pushing the onus of triaging issues onto area owners. But to do that we first need to assign an area or platform label to the issue.

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