Copy workflows when creating new cohorts

Cohort-based courses generate new lesson IDs per cohort, which means all

lesson-attached workflows (popups, automations, etc.) are lost and must be

manually recreated each time. This is especially painful when workflows contain

rich content like GIF/video embeds that can't be easily duplicated.

Expected behavior: When a new cohort is created, workflows attached to lessons in

the previous cohort should automatically carry over to the corresponding lessons

in the new cohort.

Customer impact: Creators running recurring cohort programs have to manually

rebuild every workflow for every new cohort — error-prone and time-consuming.

Missed workflows mean students don't receive key moments (e.g., graduation gift

popups).