fix: remove attached error listeners when ending connections (#600)

Author: karenc-bq

pg/lib/abstract_pg_error_handler.ts

@@ -18,7 +18,6 @@ import { ErrorHandler } from "../../common/lib/error_handler";
 import { ClientWrapper } from "../../common/lib/client_wrapper";
 import { logger } from "../../common/logutils";
 import { Messages } from "../../common/lib/utils/messages";
-import { error } from "winston";
 
 export abstract class AbstractPgErrorHandler implements ErrorHandler {
   protected unexpectedError: Error | null = null;

pg/lib/client.ts

@@ -171,6 +171,7 @@ class BaseAwsPgClient extends AwsClient implements PGClient {
       this.properties,
       "end",
       () => {
+        this.pluginService.removeErrorListener(this.targetClient);
         const res = this.targetClient!.end();
         this.targetClient = undefined;
         this.isConnected = false;