V14 added acceptance tests for the Stylesheets (#15265)

* 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

---------

Co-authored-by: Andreas Zerbst <andr317c@live.dk>

tests/Umbraco.Tests.AcceptanceTest/package-lock.json

@@ -8,7 +8,7 @@
       "hasInstallScript": true,
       "dependencies": {
         "@umbraco/json-models-builders": "^1.0.6",
-        "@umbraco/playwright-testhelpers": "^2.0.0-beta.6",
+        "@umbraco/playwright-testhelpers": "^2.0.0-beta.7",
         "camelize": "^1.0.0",
         "dotenv": "^16.3.1",
         "faker": "^4.1.0",
@@ -141,9 +141,9 @@
       }
     },
     "node_modules/@umbraco/playwright-testhelpers": {
-      "version": "2.0.0-beta.6",
-      "resolved": "https://registry.npmjs.org/@umbraco/playwright-testhelpers/-/playwright-testhelpers-2.0.0-beta.6.tgz",
-      "integrity": "sha512-waRJp0ckplzamtj3qu5JHhKZJWbZevKtjw4Nm0+O0XcuKbCF3FNE/RO9RVbFK5Htogm5oS+2vNcGapMFsQ2S2g==",
+      "version": "2.0.0-beta.7",
+      "resolved": "https://registry.npmjs.org/@umbraco/playwright-testhelpers/-/playwright-testhelpers-2.0.0-beta.7.tgz",
+      "integrity": "sha512-4dn0hJUc/OzWim0s0C8yj9Tviqx3+6aJde2j+jrlw6hocOkezw3qReKIGK1xJG5mS98dQVpOYjL7T7mfgFVXSA==",
       "dependencies": {
         "@umbraco/json-models-builders": "^1.0.6",
         "camelize": "^1.0.0",