* Add cancel adding tag mechanism and fix persistent options visible
* Add functional test for cancel adding a tag
* Create addtag.visual.spec.js and move createNotebookAndEntry to appActions.js
* Remove createDomainObjectWithDefaults function from tags.e2e.spec.js
* Integrate Percy snapshots and remove assertions
* Move createNotebookAndEntry function back to tags.e2e.spec.js
* Update locator of Annotations tab, split helper function and add test.beforeEach