Add test cases for tables with async table services and multi-writer scenarios

Add test fixtures (zipped hudi tables v6 and v8) to `crates/test/`. The test tables should cover

- COW + async clustering
- MOR + async clustering / compaction
- COW + multi-writer
- MOR + multi-writer

The test tables only need to contain timeline files. The tests can verify the right commits are read and the intended list of data files are returned by the timeline.

Start in crates/test/ and review how timeline-focused table fixtures and tests are organized. Add zipped Hudi table fixtures covering COW and MOR with async clustering, compaction, and multi-writer scenarios; done means tests verify the expected commits and intended data-file lists from the timeline.

Written by the indexing model from the issue text.