Re-enable state root validation

[frisitano]

Describe the feature

As part of #135 and preceding PR's we disabled state root validation as we were running a node client with a MPT state root implementation against blocks that have a state root associated with a bmpt. This is being done in preparation for the migration from bmpt to mpt for scroll. After the migration to mpt is complete we should re-enable state root validation. This should be done by introducing a threshold for the mpt hardfork block number. We should not validate the state root for any blocks prior to the hardfork but we should validate for blocks after the hardfork. This will allow us to remove the skip-state-root feature gate.

Additional context

No response