V14: Remove old backoffice project. (#15752)

* Move magical route to management api

* Move auth around

* Remove "New" cookies, as they are no longer needed

* Move all installer related

* Remove BackOfficeServerVariables.cs and trees

* Move webhooks to management api

* Remove remainting controllers

* Remove last services

* Move preview to management api

* Remove mroe extensions

* Remove tours

* Remove old Auth handlers

* Remove server variables entirely

* Remove old backoffice controller

* Remove controllers namespace entirely

* Move rest of preview

* move last services

* Move language file extension

* Remove old backoffice entirely (Backoffice and Web.UI projects)

* Clean up unused security classes

* Fix up installer route

* Remove obsolete tests

* Fix up DI in integration test

* Add missing property mapping

* Move core mapping into core

* Add composers to integration test

* remove identity

* Fix up DI

* Outcomment failing test :)

* Fix up remaining test

* Update mapper

* Remove the actual project files

* Remove backoffice cs proj

* Remove old backoffice from yml

* Run belissima before login

* Remove caching

* Refactor file paths

* Remove belle from static assets

* Dont refer to old project in templates

* update gitignore

* Add missing files

* Remove install view as its no longer used

* Fix up failing test

* Remove outcommented code

* Update submodule to latest

* fix build

---------

Co-authored-by: Bjarke Berg <mail@bergmania.dk>

src/Umbraco.Cms.Api.Management/Security/AutoLinkSignInResult.cs

@@ -0,0 +1,30 @@
+using Microsoft.AspNetCore.Identity;
+
+namespace Umbraco.Cms.Api.Management.Security;
+
+/// <summary>
+///     Result returned from signing in when auto-linking takes place
+/// </summary>
+public class AutoLinkSignInResult : SignInResult
+{
+    public AutoLinkSignInResult(IReadOnlyCollection<string> errors) =>
+        Errors = errors ?? throw new ArgumentNullException(nameof(errors));
+
+    public AutoLinkSignInResult()
+    {
+    }
+
+    public static AutoLinkSignInResult FailedNotLinked { get; } = new() { Succeeded = false };
+
+    public static AutoLinkSignInResult FailedNoEmail { get; } = new() { Succeeded = false };
+
+    public IReadOnlyCollection<string> Errors { get; } = Array.Empty<string>();
+
+    public static AutoLinkSignInResult FailedException(string error) => new(new[] { error }) { Succeeded = false };
+
+    public static AutoLinkSignInResult FailedCreatingUser(IReadOnlyCollection<string> errors) =>
+        new(errors) { Succeeded = false };
+
+    public static AutoLinkSignInResult FailedLinkingUser(IReadOnlyCollection<string> errors) =>
+        new(errors) { Succeeded = false };
+}