Fixes: U4-3855 Preview cookie should be a session cookie not persisted
Merge remote-tracking branch 'origin/6.2.0' into 7.0.2

Conflicts:
	src/Umbraco.Core/Configuration/UmbracoSettings.cs
	src/Umbraco.Core/Security/AuthenticationExtensions.cs
	src/umbraco.businesslogic/StateHelper.cs