* op-challenger: Fix prestate validation

Validators were not added to players created for active games, only inactive
Both the VM and output root prestates were validated against the challenger's output root prestate

* op-challenger: Add option to ignore prestate validation failures

* op-e2e: Allow invalid prestates for devnet

Also update the op-proposer options to account for a recent rename.

* op-e2e: Revert setting cannon prestate in devnetL1.json - its actually the alphabet prestate.  Deploy script dynamically loads the cannon prestate.

* op-challenger: Fix block number included in error message.

* op-challenger: Tweak error message

* op-challenger: Only ignore prestate mismatches, not RPC failures.