message: Remove the `OpenBatchOnDisconnect` event
  This event has already been demoted from error in as it started firing when FlushMode.TurnBased was set as the default and causing test failures due to undeclared log errors.
diff: @@ -25,7 +25,6 @@ import {
  normalizeError,
  logIfFalse,
  safeRaiseEvent,
  - TelemetryDataTag,
  } from "@fluidframework/telemetry-utils";
  import {
  IDocumentDeltaStorageService,
  @@ -570,21 +569,7 @@ export class DeltaManager<TConnectionManager extends IConnectionManager>
  }
  private disconnectHandler(reason: string) {
  - if (this.messageBuffer.length > 0) {
  - // Behavior is not well defined here RE batches across connections / disconnect.
  - // DeltaManager overall policy - drop all ops on disconnection and rely on
  - // container runtime to deal with resubmitting any ops that did not make it through.
  - // So drop them, but also raise error event to look into details.
  - this.logger.sendTelemetryEvent({
  - eventName: "OpenBatchOnDisconnect",
  - length: this.messageBuffer.length,
  - reason: {
  - value: reason,
  - tag: TelemetryDataTag.PackageData,
  - },
  - });
  this.messageBuffer.length = 0;
  - }
  this.emit("disconnect", reason);
  }
  