Stacks node must process successful .signers-voting results

[kantai]

The .signers-voting contract emits an event every time a vote is cast, but the stacks-node needs to use this data for getting the actual aggregate public key.

This is the method that currently loads the aggregate public key:

https://github.com/stacks-network/stacks-core/blob/next/stackslib/src/chainstate/nakamoto/mod.rs#L1800

It would need to be updated to invoke something like

(get-approved-aggregate-key reward-cycle) -> (option (buff 33))

Where get-approved-aggregate-key is a read-only method of .signers-voting.

[obycode]

Resolved with #4360.

[blockstack-devops]

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