Use Consensus blocks instead of Domain blocks to confirm Domain blocks from Challenge period

[vedhavyas]

Currently, we use domain blocks to confirm the parent domain block from the challenge period. When a domain is stalled for some reason, parent domain blocks will never be confirmed. This also has another issue where challenge period for each domain may vary depending the frequency of the domain blocks.
Using Consensus block to confirm domain blocks would ensure confirmation even when there are no domain blocks to be confirmed. This also enables use to not produce an empty bundle to push the parent domain block out of challenge period.

There are some further discussions noted on notion here - https://www.notion.so/subspacelabs/Concerns-on-Challenge-period-deriving-from-Consensus-blocks-6296267d6dc243a4a72023c3148a9c76
cc: @jfrank-summit

[dariolina]

Just to note, the StakeWithdrawalLockingPeriod and withdrawal process should be updated accordingly.

[dariolina]

Based on concerns described here https://www.notion.so/subspacelabs/Attacking-the-domain-challenge-period-f651dd289405491fba42dbceb33142d9?pvs=4 we have decided not to move forward with this and keep the domain challenge period in domain blocks.