chore(EMI-2026): Add homeViewTasksSection to success response when clearing a task.

[erikdstock]

Part of EMI-2026.

This PR adds the homeViewTasksSection field to our success response type so that we can refresh the home view with an updated task list when dismissing or acknowledging a task. Eigen PR to consume this new field and optimistically update forthcoming.

Somewhat confusingly I realized that I added this field to the taskOrError field. It is adjacent to the task on the non-error type but the field name implies that it is one thing - a task. Not sure if there is a better way here.

cc @artsy/emerald-devs
paired with @MrSltun on some of it.

[olerichter00]

Good idea 🌟

An alternative could be to just return homeView instead and then get the section from there in the client. Similar to how a lot of mutations return me (example). Maybe this simplifies the return type 🤔