Allow front end to create Todos for Designs

What does this MR do?

This MR provides the frontend with the ability to create Todos for Designs, by using the existing Projects::TodosController.

This involved a small change to FinderMethods to refer to an object's #to_ability_name method if defined, as due to its namespacing, the existing deriving of the ability name DesignManagement::Design.model_name would not work. FinderMethods fallsback to its old deriving method for when an object does not define #to_ability_name.

• Issue #198439 (closed)

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

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done