Remove task in handle_tasks in async_compute example

[IceSentry]

Objective

• It seems counterintuitive that the task removes itself
• More than once I have tried copying the code from this example and then remove the content of the task to replace it with what I need and then I get errors about a task being polled after it's already completed because I never removed it.

Solution

• Remove the task in the handle_tasks system after it's done being "handled".

Testing

• Ran the example and it still works as expected