[Task] Notify outcome of decision 2nd level review on held actions to Cinder

[eviljeff]

Description

Follow-on from https://github.com/mozilla/addons/issues/15074 - once certain Decisions have their actions held for review, on the outcome of that review we need to notify Cinder of the new action so data there is correct for future investigation and reports generated.

Acceptance Criteria

### Milestones/checkpoints
- [ ] changed decision is notified to Cinder

Checks

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

┆Issue is synchronized with this Jira Task

[eviljeff]

The notification to Cinder is a blocker at this point (the issue could be split to proceed with the action/cancellation without notifying Cinder if necessary).

What is needed in the Cinder API (but currently missing):

• The ability to override a decision on a closed job with a further decision. This is possible within Cinder's web-ui, but is not possible via their API.
  • workaround: create a decision on the entity without it being attached to be job - but we lose the connection to the original decision, and our reporting would overstate out takedown numbers
• The ability to reopen a closed job in the same queue to allow moderators to further review it
  • workaround: create a new job and link it to the existing entities. Similar deficiency - it won't be linked to the previous job and reporting would be wrong
• The ability to outright cancel a decision on a job
  • if we had overrides we could workaround by overriding the takedown decision with an approve or ignore decision