[v9.4.x] LDAP: Fix user disabling (#74318)

* [LDAP] Disable removed users on login (#74016)

* manual backport of #74016 on legacy code

* LDAP: Fix active sync with large quantities of users (#73834)

* Fix authenticate user test

pkg/services/user/usertest/fake.go

@@ -17,6 +17,7 @@ type FakeUserService struct {
 
 	GetSignedInUserFn func(ctx context.Context, query *user.GetSignedInUserQuery) (*user.SignedInUser, error)
 	CreateFn          func(ctx context.Context, cmd *user.CreateUserCommand) (*user.User, error)
+	DisableFn         func(ctx context.Context, cmd *user.DisableUserCommand) error
 
 	counter int
 }
@@ -92,6 +93,10 @@ func (f *FakeUserService) Search(ctx context.Context, query *user.SearchUsersQue
 }
 
 func (f *FakeUserService) Disable(ctx context.Context, cmd *user.DisableUserCommand) error {
+	if f.DisableFn != nil {
+		return f.DisableFn(ctx, cmd)
+	}
+
 	return f.ExpectedError
 }