fix(bendpy): remove CSV integration test that requires stage system

The embedded bendpy context does not have the system.stage table, so
file-based queries (SELECT FROM 'fs://...') cannot work. Remove the
integration test; SQL generation is already covered by mock tests in
test_connections.py.

Author: bohutang

src/bendpy/tests/test_basic.py

@@ -16,8 +16,6 @@
 from databend import SessionContext
 import pandas as pd
 import polars
-import tempfile
-import os
 
 
 class TestBasic:
@@ -63,18 +61,3 @@ def test_create_insert_select(self):
         ).to_polars()
         assert df.to_pandas().values.tolist() == [[90.0, "9", 9.0]]
 
-    def test_register_csv(self):
-        with tempfile.NamedTemporaryFile(mode="w", suffix=".csv", delete=False) as f:
-            f.write("name,age,city\n")
-            f.write("Alice,30,NYC\n")
-            f.write("Bob,25,LA\n")
-            f.write("Charlie,35,Chicago\n")
-            csv_path = f.name
-
-        try:
-            self.ctx.register_csv("people", csv_path)
-            df = self.ctx.sql("SELECT name, age, city FROM people ORDER BY age").to_pandas()
-            assert df.values.tolist() == [["Bob", "25", "LA"], ["Alice", "30", "NYC"], ["Charlie", "35", "Chicago"]]
-        finally:
-            os.unlink(csv_path)
-