Navigation: Fix Home logo always going to /login (#62658)

* only redirect to /login when anonymous access is disabled

* only search for dashboards when not logged in if anon access is enabled

* fix go logic

* add unit tests

pkg/services/navtree/navtreeimpl/navtree.go

@@ -214,10 +214,14 @@ func (s *ServiceImpl) GetNavTree(c *contextmodel.ReqContext, hasEditPerm bool, p
 
 func (s *ServiceImpl) getHomeNode(c *contextmodel.ReqContext, prefs *pref.Preference) *navtree.NavLink {
 	homeUrl := s.cfg.AppSubURL + "/"
-	homePage := s.cfg.HomePage
+	if !c.IsSignedIn && !s.cfg.AnonymousEnabled {
+		homeUrl = s.cfg.AppSubURL + "/login"
+	} else {
+		homePage := s.cfg.HomePage
 
-	if prefs.HomeDashboardID == 0 && len(homePage) > 0 {
-		homeUrl = homePage
+		if prefs.HomeDashboardID == 0 && len(homePage) > 0 {
+			homeUrl = homePage
+		}
 	}
 
 	homeNode := &navtree.NavLink{