feat: add more e2e tests for MPR and add test mode and extension (#3180)

* tests: add various e2e tests for MPR and measurements

wip

add cypress config

feat: add mode and extension for testing

add hp applied through search params

add MPR tests

apply review comments

add more e2e tests

update yarn lock

* fix unit tests failing

modes/basic-test-mode/src/index.js

@@ -54,6 +54,7 @@ const extensionDependencies = {
   '@ohif/extension-cornerstone-dicom-seg': '^3.0.0',
   '@ohif/extension-dicom-pdf': '^3.0.1',
   '@ohif/extension-dicom-video': '^3.0.1',
+  '@ohif/extension-test': '^0.0.1',
 };
 
 function modeFactory() {