chore: Clean up unused files, imports, and work on getting end-to-end tests and unit tests running (#2272)

extensions/cornerstone/src/initCornerstoneTools.js

@@ -7,6 +7,9 @@ import OHIF from '@ohif/core';
 const { log } = OHIF;
 
 export default function(configuration = {}) {
+  // TODO: Cypress tests are currently grabbing this from the window?
+  window.cornerstone = cornerstone;
+
   // For debugging
   window.cornerstoneTools = cornerstoneTools;