ci: skip test_data_equal on the GPU machine (#4260)

This test crashes on the machine iZ0xih0eykcp6eddga4w5iZ with exit code
1:
https://github.com/deepmodeling/deepmd-kit/actions/runs/11533273426/job/32106001782

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Bug Fixes**
- Enhanced test execution control to ensure compatibility with CPU
environments during continuous integration.

- **Tests**
- Updated the `test_data_equal` method to conditionally skip tests based
on the testing device and CI status.
- Retained cleanup procedures in the `tearDown` method to ensure proper
test environment management.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>

Author: njzjz

source/tests/consistent/io/test_io.py

@@ -21,6 +21,11 @@
     DeepEval,
 )
 
+from ...utils import (
+    CI,
+    TEST_DEVICE,
+)
+
 infer_path = Path(__file__).parent.parent.parent / "infer"
 
 
@@ -66,6 +71,7 @@ def tearDown(self):
             elif Path(ii).is_dir():
                 shutil.rmtree(ii)
 
+    @unittest.skipIf(TEST_DEVICE != "cpu" and CI, "Only test on CPU.")
     def test_data_equal(self):
         prefix = "test_consistent_io_" + self.__class__.__name__.lower()
         for backend_name in ("tensorflow", "pytorch", "dpmodel", "jax"):