[improve] Upgrade/Downgrade test

[dlg99]

Motivation

catch issues like https://github.com/apache/pulsar/issues/22051

Modifications

Added a test for upgrade/downgrade

Verifying this change

• [ ] Make sure that the change passes the CI checks.

This change adds tests.

Does this pull request potentially affect one of the following parts:

NO

• [ ] Dependencies (add or upgrade a dependency)
• [ ] The public API
• [ ] The schema
• [ ] The default values of configurations
• [ ] The threading model
• [ ] The binary protocol
• [ ] The REST endpoints
• [ ] The admin CLI options
• [ ] The metrics
• [ ] Anything that affects deployment

Documentation

• [ ] doc
• [ ] doc-required
• [x] doc-not-needed
• [ ] doc-complete

Matching PR in forked repository

PR in forked repository: https://github.com/dlg99/pulsar/pull/18