* Added acceptance test for Stylesheets
* Updated api test for stylesheet using new helpers and apply AAA pattern
* Bumped version of Test Helpers
* Updated api and ui tests of Stylesheet after modifying TestHelper
* Updated stylesheets ui tests using openActionMenuAtRoot()
* Added suggestions from review
* Added wait for the flaky tests
* Fixed package-lock.json
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Co-authored-by: Andreas Zerbst <andr317c@live.dk>