[AI Triage] Weekly refresh of labels for each repository knowledge base

To keep label data fresh, we'll need to create a scheduled job of some sort to refresh the index for each repository on a weekly basis.

Begin by identifying how repository knowledge-base indexes are currently refreshed and where scheduled jobs are configured; the issue names no files or tests. Done means each repository's label data is refreshed automatically on a weekly schedule.

Written by the indexing model from the issue text.