As an Experienced Contributor, I want the ability to opt-out of Image Suggestion notifications, so I stop getting the notifications if I don't want to interact with them.

In T292147 we are developing a notification that will be sent to users for image suggestions. The notification will include a link to the user's Notification Preferences, where the user can opt-out. This ticket is to add a preference to the notification preferences allowing users to opt-out of these specific notifications.

Acceptance Criteria:

• Add “Image Suggestions” to the bottom of the existing list of opt-in/out options

Existing list:

• By default, the user should be opted in to image suggestions notifications for web and apps and opted out for e-mail (these are the typical defaults).
• Add a tooltip to the "Image Suggestions" option (in the same style as the others) that says "Notify me when there is suggested image for an article I'm watching." (*Wording TBD - since we are not just relying on watchlists*)
• If the user opts out of "Image Suggestions" notifications using this new preference, they no longer receive these notifications
• Translations exist for this in languages other than English
• The preference should be added before we send our first notifications
• The preference should be included on the following wikis: pt, ru, id
• Preference changes should be tracked via WikimediaEvents (see https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/WikimediaEvents/+/refs/heads/master/includes/PrefUpdateInstrumentation.php)