feat(permissionless batches): block production without signature

[jonastheis]

1. Purpose or design rationale of this PR

This PR enables creating blocks without a valid signature. This is necessary in permissionless mode for anyone to be able to produce blocks without having access to the latest valid key according to Clique consensus.

It is part of the permissionless batch production toolkit together with #1073 and scroll-tech/scroll#1555

2. PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• build: Changes that affect the build system or external dependencies (example scopes: yarn, eslint, typescript)
• ci: Changes to our CI configuration files and scripts (example scopes: vercel, github, cypress)
• docs: Documentation-only changes
• feat: A new feature
• fix: A bug fix
• perf: A code change that improves performance
• refactor: A code change that doesn't fix a bug, or add a feature, or improves performance
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
• test: Adding missing tests or correcting existing tests

3. Deployment tag versioning

Has the version in params/version.go been updated?

• This PR doesn't involve a new deployment, git tag, docker image tag, and it doesn't affect traces
• Yes

4. Breaking change label

Does this PR have the breaking-change label?

• This PR is not a breaking change
• Yes

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[georgehao]

Why disable when DA syncing

[jonastheis]

there's a nil pointer downstream when mining blocks without the networking layer being initialized