fix(Postgres Node): Re-use connection pool across executions (#12346)

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/nodes-base/nodes/Postgres/PostgresTrigger.node.ts

@@ -321,7 +321,6 @@ export class PostgresTrigger implements INodeType {
 				}
 			} finally {
 				connection.client.removeListener('notification', onNotification);
-				if (!db.$pool.ending) await db.$pool.end();
 			}
 		};