refactor: Payout fee when proven

[LHerskind]

The fee payout should happen when proven and not when proposed as it is currently done. The reason we are currently "allowing" this is because the system does not handle reorgs so it is "same same".

[LHerskind]

When #7937 is done this might be slightly simpler to do. Should be handled before #7938.

[LHerskind]

It is insufficient that it happens at the time of a block being proven, it must happen when the block is included in the proven chain. This needs to happen as it is still possible for it to be re-orged even if the individual block is proven if a prior re-orgs.

Will wait addressing this slightly, as we can implicitly get around if when move along to the batch proving where we will likely move to sequential proving and not being able to run ahead in the same way, which removes this issue.

TL;DR: for sequential proving we can payout at verification, as it is the same as inclusion in proven chain.

I think that we might be unable to really support sequential verification though, as it could force a "domino" effect.

[LHerskind]

This was fixed as part of #8262