[mqtt.homeassistant] remove channels for no-longer-configured components (#17447)

Signed-off-by: Cody Cutrer <cody@cutrer.us>

bundles/org.openhab.binding.mqtt.homeassistant/src/main/java/org/openhab/binding/mqtt/homeassistant/internal/HaID.java

@@ -214,6 +214,13 @@ public class HaID {
         return UIDUtils.encode(result);
     }
 
+    /**
+     * Return the topic for this component, without /config
+     */
+    public String getTopic() {
+        return topic;
+    }
+
     /**
      * Return a topic, which can be used for a mqtt subscription.
      * Defined values for suffix are:

bundles/org.openhab.binding.mqtt.homeassistant/src/main/java/org/openhab/binding/mqtt/homeassistant/internal/handler/HomeAssistantThingHandler.java

@@ -150,8 +150,18 @@ public class HomeAssistantThingHandler extends AbstractMQTTThingHandler
             // Already restored component?
             @Nullable
             AbstractComponent<?> component = haComponents.get(groupID);
-
+            if (component != null) {
+                continue;
+            }
             HaID haID = HaID.fromConfig(config.basetopic, channel.getConfiguration());
+
+            if (!config.topics.contains(haID.getTopic())) {
+                // don't add a component for this channel that isn't configured on the thing
+                // anymore
+                // It will disappear from the thing when the thing type is updated below
+                continue;
+            }
+
             discoveryHomeAssistantIDs.add(haID);
             ThingUID thingUID = channel.getUID().getThingUID();
             String channelConfigurationJSON = (String) channel.getConfiguration().get("config");