V16 Added acceptance tests for regression issues (#19874)

* Updated the block editor validation message

* Updated tests for schedule publishing after unselecting all languages

* Added tests for sibdlingsOfType extension

* Updated tests due to test helper changes

* Bumped version of test helper

* Added release tag for regression issue

* Make tests for siblingsOfType run in the pipeline

* Reverted npm command

tests/Umbraco.Tests.AcceptanceTest/package.json

@@ -22,7 +22,7 @@
   },
   "dependencies": {
     "@umbraco/json-models-builders": "^2.0.37",
-    "@umbraco/playwright-testhelpers": "^16.0.32",
+    "@umbraco/playwright-testhelpers": "^16.0.33",
     "camelize": "^1.0.0",
     "dotenv": "^16.3.1",
     "node-fetch": "^2.6.7"