[Task]: implement listing-approve action that is available for cinder policies

[eviljeff]

Description

Provide a way for a cinder moderator to approve a listing from the public view. If the listing is currently disabled, this should enable the listing page.

Acceptance Criteria

• approve-listing action is available for webhook requests from Cinder
• action takes enables listing
• developer is notified by email
• developer can see the notification in devhub too

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