Add naive consensus compaction test.

Additionally, this asserts cluster metadata is properly compacted/snapshotted as implemented in #6014.

It succeeds now, and does indeed fail before metadata was properly compacted (#6014).

All Submissions:

• Contributions should target the dev branch. Did you create your branch from dev?
• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests?
2. Have you formatted your code locally using cargo +nightly fmt --all command prior to submission?
3. Have you checked your code using cargo clippy --all --all-features command?