Revert "Add test for iterating over batches in DataFrame"

This reverts commit cc6d4fd.

Author: kosiew

python/tests/test_dataframe.py

@@ -1582,18 +1582,6 @@ def test_empty_to_arrow_table(df):
     assert set(pyarrow_table.column_names) == {"a", "b", "c"}
 
 
-def test_iter_batches_dataframe(fail_collect):
-    ctx = SessionContext()
-
-    batch1 = pa.record_batch([pa.array([1])], names=["a"])
-    batch2 = pa.record_batch([pa.array([2])], names=["a"])
-    df = ctx.create_dataframe([[batch1], [batch2]])
-
-    expected = [batch1, batch2]
-    for got, exp in zip(df, expected):
-        assert got.equals(exp)
-
-
 def test_arrow_c_stream_to_table(fail_collect):
     ctx = SessionContext()