feat: Immediately delete completed tasks

[evanh]

Previously activations that completed successfully would have their status updated, and then the upkeep thread would remove all the completed activations in batches. Now that the status update is happening in batches, the completed activations can also be immediately deleted instead of waiting for the upkeep thread.

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[untitaker]

for my understanding, the upkeep thread also used to batch deletes, right?

is it planned to remove some stuff from upkeep in a later change?

[evanh]

for my understanding, the upkeep thread also used to batch deletes, right?

is it planned to remove some stuff from upkeep in a later change?

No, because the upkeep thread itself also moves things to "Completed". After it handles some errors states it will mark the task as completed and then delete it. The expectation though is that there are a lot less things being deleted by the upkeep thread.