Fix CI by deleting test_polars_struct_thread_panic_error
Delete `test_polars_struct_thread_panic_error`.

Note that the previous CI-Hub dataset (with the specific Parquet file) has been deleted.

Fix #3069.
Fix CI by deleting test_polars_struct_thread_panic_error: Delete `test_polars_struct_thread_panic_error`.

Note that the previous CI-Hub dataset (with the specific Parquet file) has been deleted.

Fix #3069.