Make op-reth validation client optional #69
Description
The op-reth client during the e2e tests only runs to validate that the blocks generated by the builder are valid blocks and conform to the consensus rules, this is, an off-the-shelf op-reth node can compute the block too.
Right now we run this validator client alongside every e2e test that we have, but, for some of the tests it is an overkill and it does not give us any extra information (i.e. revert tests).
Thus, we should make running this sidecar client optional.