Consider rewards denial when closing allocations

[fordN]

Background

Currently the indexer-agent does not consider whether a subgraph deployment has been denied rewards when closing an allocation. The agent does consider the deniedAt field when evaluating when a deployment is worth allocating towards, but does not consider it when closing.
In most cases this behavior works well, but the subgraph availability oracle is not perfect and sometimes it denies rewards incorrectly. In those cases the indexer-agent should hold off on closing the allocation until the rewards are no longer denied.

Solution

Let's discuss what we think is the desired behavior. I'll present a few proposals to kick off discussion.

1. Use requireSupported to decide whether to auto close or not; require manual intervention to close denied subgraphs with requireSupported = true. In the case of requireSupported = true and deniedAt is not null, the agent will log a warning and not add anything to the queue. In order to close the allocation the indexer will need to either: update requireSupported to false on the matching indexing rule, or manually queue an execute the action.

2. Always add the action to the queue (instead of just logging in some cases like above), and use the requireSupported value and the allocation management mode value to decide how it gets added to the actions queue. These unallocate actions in the queue should be clearly marked in some way so indexer can see that they will not collect rewards if executed.

   requireSupported	allocationManagement	agent action
   true	auto	Add unallocate action to the queue with status = queued, clearly label action as not receiving indexing rewards
   true	oversight	Add unallocate action to the queue with status = queued, clearly label action as not receiving indexing rewards
   true	manual	Do not add action to the queue
   false	auto	Add unallocate action to the queue with status = approved
   false	oversight	Add unallocate action to the queue with status = queued
   false	manual	Do not add action to the queue