test(e2e): replace waitForVolumeLoad with viewport render waits (#6000)

tests/Invert.spec.ts

@@ -1,4 +1,10 @@
-import { checkForScreenshot, screenShotPaths, test, visitStudy } from './utils';
+import {
+  checkForScreenshot,
+  screenShotPaths,
+  test,
+  visitStudy,
+  waitForViewportsRendered,
+} from './utils';
 
 test.beforeEach(async ({ page }) => {
   const studyInstanceUID = '1.3.6.1.4.1.25403.345050719074.3824.20170125095438.5';
@@ -8,6 +14,6 @@ test.beforeEach(async ({ page }) => {
 
 test('should invert the image', async ({ page, mainToolbarPageObject }) => {
   await mainToolbarPageObject.moreTools.invert.click();
-  await mainToolbarPageObject.waitForVolumeLoad();
+  await waitForViewportsRendered(page);
   await checkForScreenshot(page, page, screenShotPaths.invert.invertDisplayedCorrectly);
 });