Update screenshots (#6934)

* update connectome screenshot

* add rotated kiwi screenshot

* throw error if browserstack credentials aren't available

frontend/javascripts/test/puppeteer/dataset_rendering.screenshot.ts

@@ -21,6 +21,12 @@ if (!WK_AUTH_TOKEN) {
   throw new Error("No WK_AUTH_TOKEN specified.");
 }
 
+if (process.env.BROWSERSTACK_USERNAME == null || process.env.BROWSERSTACK_ACCESS_KEY == null) {
+  throw new Error(
+    "BROWSERSTACK_USERNAME and BROWSERSTACK_ACCESS_KEY must be defined as env variables.",
+  );
+}
+
 process.on("unhandledRejection", (err, promise) => {
   console.error("Unhandled rejection (promise: ", promise, ", reason: ", err, ").");
 });
@@ -95,7 +101,8 @@ test.beforeEach(async (t) => {
   // @ts-expect-error ts-migrate(7017) FIXME: Element implicitly has an 'any' type because type ... Remove this comment to see the full error message
   global.FetchError = FetchError;
 });
-// These are the datasets that are available on our dev instance
+
+// These datasets are available on our dev instance (e.g., master.webknossos.xyz)
 const datasetNames = [
   "ROI2017_wkw",
   "2017-05-31_mSEM_aniso-test",
@@ -105,6 +112,7 @@ const datasetNames = [
   "float_test_dataset",
   "Multi-Channel-Test",
   "connectome_file_test_dataset",
+  "kiwi", // This dataset is rotated and translated.
 ];
 
 type DatasetName = string;
@@ -125,6 +133,7 @@ const viewOverrides: Record<string, string> = {
     '{"position":[63,67,118],"mode":"orthogonal","zoomStep":0.826,"stateByLayer":{"segmentation":{"meshInfo":{"meshFileName":"meshfile-with-name","meshes":[{"segmentId":4,"seedPosition":[64,75,118],"isPrecomputed":true,"meshFileName":"meshfile-with-name"},{"segmentId":12,"seedPosition":[107,125,118],"isPrecomputed":false,"mappingName":"agglomerate_view_70","mappingType":"HDF5"},{"segmentId":79,"seedPosition":[110,78,118],"isPrecomputed":false,"mappingName":null,"mappingType":null}]}}}}',
   connectome_file_test_dataset:
     '{"position":[102,109,60],"mode":"orthogonal","zoomStep":0.734,"stateByLayer":{"segmentation":{"connectomeInfo":{"connectomeName":"connectome","agglomerateIdsToImport":[1]}}}}',
+  kiwi: "1191,1112,21,0,8.746",
 };
 const datasetConfigOverrides: Record<string, PartialDatasetConfiguration> = {
   ROI2017_wkw_fallback: {