op-node: Better testing for P2P block gossiping validation function

This test is what needs to be updated: https://github.com/ethereum-optimism/optimism/blob/6cce3728b7bed5e36234aeba3b773e0f97867be3/op-node/p2p/gossip_test.go#L123.

Right now we only have tests for a small subset of the block validation conditions. We should extend this to test for of the conditions. We may also want to split out the portions which are P2P specific and which are payload specific.