[action] [PR:24360] [Mellanox][Smartswitch] Add warning log for DPU going down (#1830)

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#### Why I did it
Since we have a fallback mechanism to force power off if regular power off fails, the going down message severity is changed from error to warning. If force power off also fails we have an error log added to the syslog

##### Work item tracking
- Microsoft ADO **(number only)**:

#### How I did it
Change log level for the log message

#### How to verify it
Manual verification for log level in the syslog
`tail -f /var/log/syslog | grep "chassisd"`
should yield
`WARN pmon#chassisd[49]: dpu0: Going Down Unsuccessful`
unit test is updated
`tests/test_dpuctlplat.py::TestDpuCtlPlatInit::test_setup_logger PASSED [ 45%]`

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Author: mssonicbld

platform/mellanox/mlnx-platform-api/sonic_platform/dpuctlplat.py

@@ -115,11 +115,13 @@ def print_with_time(msg):
         if use_print:
             self.logger_info = print_with_time
             self.logger_error = print_with_time 
+            self.logger_warning = print_with_time
             self.logger_debug = print_with_time
             return
         self.logger_debug = logger.log_debug
         self.logger_info = logger.log_info
         self.logger_error = logger.log_error
+        self.logger_warning = logger.log_warning
 
     def log_debug(self, msg=None):
         # Print only in verbose mode
@@ -131,6 +133,9 @@ def log_info(self, msg=None):
     def log_error(self, msg=None):
         self.logger_error(f"{self.dpu_name}: {msg}")
 
+    def log_warning(self, msg=None):
+        self.logger_warning(f"{self.dpu_name}: {msg}")
+
     def run_cmd_output(self, cmd, raise_exception=True):
         try:
             return subprocess.check_output(cmd).decode().strip()
@@ -196,7 +201,8 @@ def dpu_go_down(self):
         except (FileNotFoundError, PermissionError) as inotify_exc:
             raise type(inotify_exc)(f"{self.dpu_name}:{str(inotify_exc)}")
         if not dpu_shtdn_rdy:
-            self.log_error(f"Going Down Unsuccessful")
+            # Log level warning since we have a fallback to force power off
+            self.log_warning(f"Going Down Unsuccessful")
             return False
         return True
 

platform/mellanox/mlnx-platform-api/tests/test_dpuctlplat.py

@@ -78,6 +78,7 @@ def test_setup_logger(self, dpuctl_obj):
         assert dpuctl_obj.logger_info != print
         assert dpuctl_obj.logger_error != print
         assert dpuctl_obj.logger_debug != print
+        assert dpuctl_obj.logger_warning != print
 
     def test_get_pci_dev_path(self, dpuctl_obj):
         """Test PCI device path retrieval"""