[stacks-signer] Signers should broadcast the same DKG when their broadcasted transaction is no longer valid

[jferrant]

Currently signers only best effort construct a DKG vote-for-aggregate transaction. If the same account builds a vote at the same time as another transaction submission, nonces could be wrong. The signer will not think to broadcast an updated transaction if the nonce is bad and may even trigger an entirely new dkg round. Should not do a new DKG round, but should attempt to rebroadcast their vote if it was never registered in the contract and their nonce is oudated.

[blockstack-devops]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.