message: stress: return blobs while offline
  Change `FaultInjectionDocumentStorageService.readBlob()` to return blobs
  when in simulated offline mode. This matches behavior of ODSP driver,
  which caches the initial snapshot.
diff: @@ -340,7 +340,11 @@ export class FaultInjectionDocumentStorageService implements IDocumentStorageSer
  }
  public async readBlob(id: string): Promise<ArrayBufferLike> {
  - this.throwIfOffline();
  + // Intentionally return blobs even while offline. Current driver behavior is to cache the initial
  + // snapshot which means readBlob() calls will succeed regardless of connection status. While
  + // depending on this behavior is not advised, it's more accurate to real usage. Additionally, very
  + // long service response delays can cause offline injection to interfere with Container load, which
  + // is not expected to succeed offline, as well as interfering with the test setup itself.
  return this.internal.readBlob(id);
  }
  