Fix: Segmentation Hide All fails when switching from 2D to 3D fourUp (#5995)

* Fix: Segmentation "Hide All" fails when switching from 2D to 3D four-up viewport

* Update based on the review comment on segmentation load in 3d fourup

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

* fix: simplify the conditional logic

* fix: playwright test

* fix: playwright test

* fix: render timeout in test

---------

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>
Co-authored-by: Belbin-GK <150322972+Belbin-GK@users.noreply.github.com>
Co-authored-by: Devu Jayalekshmi <devu.jayalekshmi@trenser.com>
Co-authored-by: Bill Wallace <wayfarer3130@gmail.com>

tests/SEGHydrationFrom3DFourUp.spec.ts

@@ -60,6 +60,9 @@ test.describe('3D four up SEG hydration', async () => {
 
     // Wait until all viewports have finished rendering
     await viewportRenderCycle;
+    // Hydration propagates labelmap volumes to MPR viewports asynchronously after the
+    // first render cycle resolves.
+    await waitForViewportsRendered(page, { timeout: 240000 });
 
     await checkForScreenshot({
       page,