Removing the integration_object_store test which serves little value

This test basically asserts that the ObjectStore implementations
actually do their jobs

crates/deltalake-core/.gitignore

@@ -1,12 +1,4 @@
 target/
 /.idea/
 *.bat
-tests/data/checkpoints_tombstones/expired/
-tests/data/checkpoints_tombstones/metadata_broken/
-tests/data/checkpoints_tombstones/metadata_false/
-tests/data/checkpoints_tombstones/metadata_true/
-tests/data/checkpoints_with_expired_logs/
-tests/data/read_null_partitions_from_checkpoint/
-tests/data/action_reconciliation/
-tests/data/simple_table_with_no_checkpoint/
-tests/data/simple_table_with_no_checkpoint_2/
+tests/data