ci: Added verification on Before hook to avoid navigating again to viewer page (#1505)

* Added verification on Before hook to avoid navigating again to viewer page

* Removed unecessary screenshots and duplicated test cases

* Navigation Fix for HTML extension and improved Flip button verification

Co-authored-by: Danny Brown <danny.ri.brown@gmail.com>

platform/viewer/cypress/integration/visual-regression/PercyCheckOHIFExtensionPDF.spec.js

@@ -1,8 +1,10 @@
 describe('Visual Regression - OHIF PDF Extension', () => {
   before(() => {
-    cy.openStudy('Dummy');
-    cy.expectMinimumThumbnails(6);
-  });
+    cy.checkStudyRouteInViewer(
+      '1.2.826.0.13854362241694438965858641723883466450351448'
+    );
+    cy.expectMinimumThumbnails(5);
+  });v
 
   it('drags and drop a PDF thumbnail into viewport', () => {
     cy.get('[data-cy="thumbnail-list"]')