Remove deprecated OPCMv1 fields in ReadSuperchainDeployment script

### Overview
Clean up deprecated fields that were used for OPCMv1 compatibility. These fields are no longer needed once OPCMv1 is fully deprecated.

### Fields to Remove

`OPCMAddress` field:
- `op-deployer/pkg/deployer/opcm/read_superchain_deployment.go` - Remove `OPCMAddress common.Address` field from struct.
- `op-deployer/pkg/deployer/pipeline/init.go` - Remove `OPCMAddress` handling.
- `packages/contracts-bedrock/scripts/deploy/ReadSuperchainDeployment.s.sol` - Remove `IOPContractsManager opcmAddress` field.

`ProtocolVersions` fields:
- `op-deployer/pkg/deployer/opcm/read_superchain_deployment.go` - Remove `ProtocolVersions` fields.
- `op-deployer/pkg/deployer/pipeline/init.go` - Remove `ProtocolVersions` handling.
- `op-deployer/pkg/deployer/pipeline/init_test.go` - Remove `ProtocolVersions` test cases.
- `packages/contracts-bedrock/scripts/deploy/ReadSuperchainDeployment.s.sol` - Remove `ProtocolVersions` fields.

Start with op-deployer/pkg/deployer/opcm/read_superchain_deployment.go and op-deployer/pkg/deployer/pipeline/init.go, then inspect the matching fields in packages/contracts-bedrock/scripts/deploy/ReadSuperchainDeployment.s.sol. Remove the deprecated OPCMAddress and ProtocolVersions handling, update the listed init_test.go cases, and run the relevant pipeline tests to confirm the cleanup is complete.

Written by the indexing model from the issue text.