E2E test: Percy visua regression improvements

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

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+describe('Visual Regression - OHIF PDF Extension', () => {
+  before(() => {
+    cy.openStudy('Dummy');
+    cy.expectMinimumThumbnails(6);
+  });
+
+  it('drags and drop a PDF thumbnail into viewport', () => {
+    cy.get('[data-cy="thumbnail-list"]')
+      .contains('DOC')
+      .drag('.viewport-drop-target');
+
+    cy.get('.DicomPDFViewport')
+      .its('length')
+      .should('be.eq', 1);
+
+    // This won't work unless we switch to an extension that renders using `canvas`
+    // Currently, we rely on the browser's built-in implementation
+    cy.screenshot('PDF Extension - Should load PDF file');
+    cy.percyCanvasSnapshot('PDF Extension - Should load PDF file');
+  });
+});