🚧 [WIP] T334860: Add suggestion notification enabling checkmark

[medied]

🚧 WORK IN PROGRESS

Description

Enables users to specify if they would like to receive email notifications for suggested collections. Dependent on https://github.com/WikipediaLibrary/TWLight/pull/1166

Phabricator Ticket

https://phabricator.wikimedia.org/T334860

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Minor change (fix a typo, add a translation tag, add section to README, etc.)