[Bug]: Avoid recomputing DKG from scratch on key rotation submit failure

[matteojug]

Bug - Avoid recomputing DKG from scratch on key rotation submit failure

1. Description

Currently if the bootstrap signer set changes we do a new DKG round and verify them. If then we fail to submit a rotate key (eg, because of a fast block or a timeout) at the next tenure we will again try to DKG again from scratch since the bootstrap signer set is still changed wrt the registry.

Since we have verified shares matching the bootstrap set, we should probably just skip DKG and try to submit a rotate key for those.

[joncode5]

Your project has has applied a fix:
8baf598

Please acknowledge the original report detailing the issue:
https://gist.github.com/joncode5/a00713a3d18aca80ba57bcabec750a83
#1696
#1698

Failure to acknowledge the report while applying the fix is theft of IP and the matter will continue to escalate until proper attribution/acknowledgement is made.

https://web.archive.org/web/20250605043333/https://github.com/stacks-sbtc/sbtc/commit/8baf5984c25e67f228ddfba641e226d11c135047