send owner email for override of takedown -> ignore

[eviljeff]

Fixes: mozilla/addons#15246

Description

Small change to treat IGNORE as a valid action that could be used to override a takedown (DISABLE_ADDON, etc) decision.

Context

See issue - mainly this was because of how we treated overrides - i.e. as the same as appeals, where Ignore isn't a valid grant appeal policy.

Testing

• Report some content to Cinder for Abuse
• in Cinder reject/disable/ban the content with a takedown related policy
• reply the webhook payload locally
• see the developer and reporter got emails saying the content was removed
• override the decision in Cinder to Ignore
• reply the webhook payload loclly
• see the developer gets a new email explaining we changed or minds

Checklist

• Add #ISSUENUM at the top of your PR to an existing open issue in the mozilla/addons repository.
• Successfully verified the change locally.
• The change is covered by automated tests, or otherwise indicated why doing so is unnecessary/impossible.
• Add before and after screenshots (Only for changes that impact the UI).
• Add or update relevant docs reflecting the changes made.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: src/olympia/abuse/models.py

Function	Unhandled Issue
notify_reviewer_decision	ConnectionError: b'\n\n\n<title>502 ... ... Event Count: 7

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