fix(segmentation overlays): Allow for the addition of multiple segmentation overlays. (#5189)

tests/RTHydrationFromMPR.spec.ts

@@ -13,14 +13,20 @@ test('should hydrate an RTSTRUCT from MPR', async ({ page }) => {
   await page.getByTestId('Layout').click();
   await page.getByTestId('MPR').click();
 
+  await page.waitForTimeout(5000);
+
   await checkForScreenshot(page, page, screenShotPaths.rtHydrationFromMPR.mprBeforeRT);
 
   await page.getByTestId('study-browser-thumbnail-no-image').dblclick();
 
+  await page.waitForTimeout(5000);
+
   await checkForScreenshot(page, page, screenShotPaths.rtHydrationFromMPR.mprAfterRT);
 
   await page.getByTestId('yes-hydrate-btn').click();
 
+  await page.waitForTimeout(5000);
+
   await checkForScreenshot(page, page, screenShotPaths.rtHydrationFromMPR.mprAfterRTHydrated);
 
   await page.getByTestId('Layout').click();