consensus: test to ensure dealers don't fall out of the peer set on repeated DKG failures

[SuperFluffy]

Describe the feature

https://github.com/tempoxyz/tempo/issues/933 is covered, but there should be an e2e test for this scenario:

Completely replace the on-chain validator set, but make the DKG ceremony fail 2 times in a row to cover the scenario described by the issue.

Additional context

Right now we don't have the ability to force a DKG failure. How to add this?