Revert "grpc-js: pick_first: Don't automatically reconnect after connection drop"

This reverts commit 4a3fefa2b3.

packages/grpc-js/src/load-balancer-pick-first.ts

@@ -348,6 +348,7 @@ export class PickFirstLoadBalancer implements LoadBalancer {
       if (newState !== ConnectivityState.READY) {
         this.removeCurrentPick();
         this.calculateAndReportNewState();
+        this.requestReresolution();
       }
       return;
     }