[Task]: Backfill data for existing ActivityLogs that are missing reasons.

[KevinMind]

Description

Once we fix #15352 we'll want to backfill data to make sure past ActivityLog for actual rejections after a delay have the right ReviewActionReasons attached (through ReviewActionReasonLog - that should happen automatically when a ReviewActionReasons instance is added to the arguments of the ActivityLog), starting from 2025-01-

This should happen through a one-off management command firing a task.

Cinder decisions need to be updated as well. Each ReviewActionReason is linked to a CinderPolicy and each ContentDecision is linked to CinderPolicy through a M2M. When we create decisions in Cinder, we pass a list of policy_uuids corresponding to the policies attached to the decision. That needs to be replicated to backfill the data in Cinder - this might require a new API on their side to edit a decision, as they are not supposed to be changed so the API to do that might not exist yet.

Acceptance Criteria

Milestones/checkpoints

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1. Missing link between ActivityLog and ReviewActionReasons is backfilled for past rejections that are missing it
2. Cinder data is also backfilled

Checks

• If I have identified that the work is specific to a repository, I have removed "repository:addons-server" or "repository:addons-frontend"

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