Backport 62658 to v9.4.x (#64545)

* 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

(cherry picked from commit 3336327306)

* remove file i accidentally left in :/

* import correct method

pkg/api/frontendsettings.go

@@ -175,6 +175,7 @@ func (hs *HTTPServer) getFrontendSettingsMap(c *contextmodel.ReqContext) (map[st
 			"enabledFeatures": hs.License.EnabledFeatures(),
 		},
 		"featureToggles":                   hs.Features.GetEnabled(c.Req.Context()),
+		"anonymousEnabled":                 hs.Cfg.AnonymousEnabled,
 		"rendererAvailable":                hs.RenderService.IsAvailable(c.Req.Context()),
 		"rendererVersion":                  hs.RenderService.Version(),
 		"secretsManagerPluginEnabled":      secretsManagerPluginEnabled,