[Task]: make replaying cinder webhooks not terrible.

[KevinMind]

Description

mozilla/addons-server#23633 (comment)

Basically this.

Acceptance Criteria

• [ ] can view a webhook from cinder based on the given cinder ID
• can replay a webhook from cinder based on an input json file

┆Issue is synchronized with this Jira Task

[diox]

can view a webhook from cinder based on the given cinder ID

AFAIK there is no API in Cinder to do this, and some manual work is still required anyway to grab the decision id after the decision has been made, so I'm skipping this.