[action] [PR:24393] Enhance supervisor-proc-exit-listener script to handle redis-communication failure case gracefully (#1842)

#### Why I did it
redis-server is considered as critical process in database container.
However, currently supervisor-proc-exit-listener will break if
redis-server exits. By design, supervisor-proc-exit-listener should
1. periodically logging a critical process is not running if container
auto_restart is disabled
2. kill the container if container auto_restart is enabled

This PR will help upervisor-proc-exit-listener achieve designed behavior
if redis-server exits

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

#### How I did it

#### How to verify it
Kill the redis-server process inside database container.
Observing logs:
```
2025 Oct 31 01:25:27.304563 sonic INFO database#supervisord 2025-10-31 01:25:27,303 WARN exited: redis (terminated by SIGKILL; not expected)
2025 Oct 31 01:25:28.309293 sonic WARNING database#supervisor-proc-exit-listener: Unable to retrieve features table from Config DB: Unable to connect to redis - Connection refused(1): Cannot assign requested address
2025 Oct 31 01:26:28.436837 sonic ERR database#supervisor-proc-exit-listener: Process 'redis' is not running in namespace 'host' (1.0 minutes).
2025 Oct 31 01:27:28.559959 sonic ERR database#supervisor-proc-exit-listener: Process 'redis' is not running in namespace 'host' (2.0 minutes).
```

#### Which release branch to backport (provide reason below if selected)

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- [ ] 202205
- [ ] 202211
- [ ] 202305
- [ ] 202311
- [ ] 202405
- [ ] 202411
- [ ] 202505

#### Tested branch (Please provide the tested image version)

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Author: mssonicbld

files/scripts/supervisor-proc-exit-listener

@@ -96,22 +96,22 @@ def get_autorestart_state(container_name, use_unix_socket_path):
     @return: Return the status of auto-restart feature.
     """
     config_db = swsscommon.ConfigDBConnector(use_unix_socket_path=use_unix_socket_path)
-    config_db.connect()
-    features_table = config_db.get_table(FEATURE_TABLE_NAME)
+    try:
+        config_db.connect()
+        features_table = config_db.get_table(FEATURE_TABLE_NAME)
+    except RuntimeError as e:
+        syslog.syslog(syslog.LOG_WARNING, "Unable to retrieve features table from Config DB: {}".format(e))
+        return ""
+
     if not features_table:
-        syslog.syslog(syslog.LOG_ERR, "Unable to retrieve features table from Config DB. Exiting...")
-        sys.exit(2)
+        syslog.syslog(syslog.LOG_WARNING, "Empyt features table")
+        return ""
 
     if container_name not in features_table:
-        syslog.syslog(syslog.LOG_ERR, "Unable to retrieve feature '{}'. Exiting...".format(container_name))
-        sys.exit(3)
-
-    is_auto_restart = features_table[container_name].get('auto_restart')
-    if not is_auto_restart:
-        syslog.syslog(
-            syslog.LOG_ERR, "Unable to determine auto-restart feature status for '{}'. Exiting...".format(container_name))
-        sys.exit(4)
+        syslog.syslog(syslog.LOG_WARNING, "Unable to retrieve feature '{}'".format(container_name))
+        return ""
 
+    is_auto_restart = features_table[container_name].get('auto_restart', 'enabled')  # Use default if field not found
     return is_auto_restart
 
 def publish_events(events_handle, process_name, container_name):
@@ -163,7 +163,7 @@ def main(argv):
 
                 if (process_name in critical_process_list or group_name in critical_group_list) and expected == 0:
                     is_auto_restart = get_autorestart_state(container_name, use_unix_socket_path)
-                    if is_auto_restart != "disabled":
+                    if is_auto_restart == "enabled":
                         MSG_FORMAT_STR = "Process '{}' exited unexpectedly. Terminating supervisor '{}'"
                         msg = MSG_FORMAT_STR.format(payload_headers['processname'], container_name)
                         syslog.syslog(syslog.LOG_INFO, msg)