Test "Tenure extend for bad tenures" on Nakamoto Testnet

[aldur]

Ref #5452.

[obycode]

You could probably trigger the bad block commit scenario by adjusting the config on one miner, setting the block_commit_delay_ms to 0 in the [miner] section and setting max_rbf in the [burnchain] section to 100. That miner would then likely have a bad block commit every time it wins and the previous good miner should extend.