contracts-bedrock: initializable test coverage

[tynes]

We look through the various contracts to see which have _initialized and then assert that they cannot be initialized again. Right now we only do this for contracts in src/{L1,L2} but we should instead be testing all of the contracts in src.

See https://github.com/ethereum-optimism/optimism/pull/8377 for more details

[smartcontracts]

What happened to this? cc @tynes

[tynes]

this has been completed