* contracts-bedrock: remove bindings requirement

Previously, CI enforced that bindings were kept up to date with
any changes to the smart contracts. This resulted in a lot of
churn with CI, created large diffs when opening PRs and also
took a long time to recompile and generate bindings.

Now that no major services depend on `op-bindings`, we can remove
the need to enforce they are kept up to date. The rest of the bindings
themselves can be removed in a separate PR. Merging this gives a sigh
of relief for all smart contract devs working on the optimism codebase.

* op-bindings-e2e: delete