chore: Update monitor service and instance controller

Refactored the instance controller and monitor service to improve the connection handling and management of WhatsApp instances.

- Modified the instance controller to close the WebSocket connection and restart the instance instead of reloading it.
- Updated the monitor service to remove the instance from the `waInstances` object and emit an event to clean up and remove the instance data.
- Fixed an issue where the instance was not being removed from the `waInstances` object.

Files affected:
- CHANGELOG.md
- src/api/controllers/instance.controller.ts
- src/api/services/monitor.service.ts

src/api/services/monitor.service.ts

@@ -336,18 +336,18 @@ export class WAMonitoringService {
 
   private removeInstance() {
     this.eventEmitter.on('remove.instance', async (instanceName: string) => {
-      try {
-        this.waInstances[instanceName] = undefined;
-      } catch (error) {
-        this.logger.error(error);
-      }
-
       try {
         this.cleaningUp(instanceName);
         this.cleaningStoreData(instanceName);
       } finally {
         this.logger.warn(`Instance "${instanceName}" - REMOVED`);
       }
+
+      try {
+        delete this.waInstances[instanceName];
+      } catch (error) {
+        this.logger.error(error);
+      }
     });
     this.eventEmitter.on('logout.instance', async (instanceName: string) => {
       try {