Add config to limit concurrent logins (#14967)

* Add new config options

* Change validation interval + related changes

* Fix typo

* Temp fix

* Set new setting to false for new dotnet projects

* Added logic to update security stamp on sign in + fixed wierd code calling handle signIn twice

* Cleanup

* Adding empty ctors

---------

Co-authored-by: Elitsa <elm@umbraco.dk>

tests/Umbraco.Tests.UnitTests/Umbraco.Web.Common/Security/MemberSignInManagerTests.cs

@@ -70,7 +70,8 @@ public class MemberSignInManagerTests
             Mock.Of<IAuthenticationSchemeProvider>(),
             Mock.Of<IUserConfirmation<MemberIdentityUser>>(),
             Mock.Of<IMemberExternalLoginProviders>(),
-            Mock.Of<IEventAggregator>());
+            Mock.Of<IEventAggregator>(),
+            Mock.Of<IOptions<SecuritySettings>>(x => x.Value == new SecuritySettings()));
     }
 
     private static Mock<MemberManager> MockMemberManager()