* op-deployer: Test for existing OPCM

Adds a test for deployments against an existing OPCM. The test works by spinning up an Anvil instance and forking Sepolia. To run this test, you'll need to specify two env vars:

- `SEPOLIA_RPC_URL`: RPC URL for a Sepolia node.
- `ENABLE_ANVIL`: Set to `true` to enable the test.

In CI, the test uses our internal CI RPC nodes.

* goimports

* ensure streams close

* lint

* run anvil as part of unit not integration tests

* simplify

* remove foundry from kurtosis

* use auto mine

* mount artifacts

* redeploy OPCM

* comment