Remove Multi ASIC namespace Check. (sonic-net#3783)

* Remove Multi ASIC namespace Check.

* fix ut.

Author: xincunli-sonic

config/main.py

@@ -1397,14 +1397,6 @@ def config_file_yang_validation(filename):
     if not isinstance(config, dict):
         return False
 
-    # If the device is multi-ASIC, check if all required namespaces exist
-    if multi_asic.is_multi_asic():
-        required_namespaces = [HOST_NAMESPACE, *multi_asic.get_namespace_list()]
-        for ns in required_namespaces:
-            asic_name = HOST_NAMESPACE if ns == DEFAULT_NAMESPACE else ns
-            if asic_name not in config:
-                return False
-
     sy = sonic_yang.SonicYang(YANG_DIR)
     sy.loadYangModel()
     asic_list = [HOST_NAMESPACE]

tests/config_test.py

@@ -1286,15 +1286,6 @@ def test_config_file_yang_validation(self):
                 mock_read_json_file.assert_called_once_with('dummy_file.json')
                 mock_load_yang_model.assert_not_called()
 
-        # Test with missing namespaces in multi-ASIC config
-        with mock.patch('config.main.read_json_file', return_value={'localhost': {}}) as mock_read_json_file:
-            with mock.patch('config.main.multi_asic.is_multi_asic', return_value=True):
-                with mock.patch('config.main.multi_asic.get_namespace_list', return_value=['asic0', 'asic1']):
-                    with mock.patch('config.main.sonic_yang.SonicYang.loadYangModel') as mock_load_yang_model:
-                        assert not config_file_yang_validation('dummy_file.json')
-                        mock_read_json_file.assert_called_once_with('dummy_file.json')
-                        mock_load_yang_model.assert_not_called()
-
         # Test with valid config
         valid_config = {
                 'DEVICE_METADATA': {