Resolve "Automatically mark To-do as done when an alert is resolved"

What does this MR do?

When a user resolves an alert, this change will also resolve any Todos the user has for the alert.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Part of #216143 (closed)