[Feature] Improve the compatibility test between the new and old versions of paimon

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar.

### Motivation

1. New paimon version read the old paimon metadata and file
2. Old paimon version read the new paimon metadata and file

Both of the above two modes should be compatible.

### Solution

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start by locating the existing compatibility tests for Paimon metadata and files. Determine how they currently exercise new-to-old and old-to-new reads, then define done as both directions being covered and passing across the supported versions.

Written by the indexing model from the issue text.