The annotation reference tests now show the date/time placeholder, but since localization is not active we don't see the actual date/time string. It would be nice to be able to have this in the reference images.
return new Promise((resolve, reject) => {
            const reader = new FileReader();
            reader.onload = () => {
              resolve(reader.result);
            };
            reader.onerror = reject;
            reader.readAsDataURL(blob);
          });
        })
        .then(dataUrl => {
          return new Promise((resolve, reject) => {
            image.onload = resolve;
            image.onerror = evt => {
              if (silentErrors) {
                resolve();
                return;
              }
              reject(evt);
            };
            image.src = dataUrl;
          });
        })
        .catch(reason => {
          throw new Error(`Error inlining image (${url}): ${reason}`);
        })
    );
  }
  await Promise.all(promises);
}
async function convertCanvasesToImages(annotationCanvasMap, outputScale) {