Fix s/finalization/finalization_blocks in MockDaConfig in examples

[citizen-stig]

Description

And other outdated comments.

• I have updated CHANGELOG.md with a new entry if my PR makes any breaking changes or fixes a bug. If my PR removes a feature or changes its behavior, I provide help for users on how to migrate to the new behavior.
• I have carefully reviewed all my Cargo.toml changes before opening the PRs. (Are all new dependencies necessary? Is any module dependency leaked into the full-node (hint: it shouldn't)?)

Testing

All existing tests are passing

Docs

No updates

[greptile-apps]

Greptile Overview

Greptile Summary

This PR fixes a configuration field naming inconsistency in MockDa config files and adds validation to prevent similar issues in the future.

Key changes:

• Corrected finalization to finalization_blocks in two config files
• Added #[serde(deny_unknown_fields)] to MockDaConfig struct to catch typos at deserialization time
• Added additionalProperties: false to the JSON schema for stricter validation
• Updated outdated comment in Celestia config about default timeout value
• Added new commented configuration options for reference

The change is backward-incompatible for configs using the incorrect finalization field name, but this prevents silent misconfigurations where the field was being ignored.

Confidence Score: 5/5

• This PR is safe to merge with no issues found
• All changes are straightforward corrections fixing naming inconsistencies and adding proper validation. The stricter validation is a positive change that will catch configuration errors earlier.
• No files require special attention

Important Files Changed

Filename	Overview
crates/adapters/mock-da/src/config.rs	added deny_unknown_fields to prevent misconfigurations
examples/demo-rollup/configs/mock_rollup_config.toml	fixed finalization to finalization_blocks, added new commented config options
typescript/examples/soak-testing/templates/rollup.toml	corrected finalization to finalization_blocks