Simplify open feature setup (#107632)

* Simplify open feature setup

* Fix linter issues

* Apply review feedback

* Fix integration tests setup

pkg/services/navtree/navtreeimpl/navtree.go

@@ -37,7 +37,6 @@ type ServiceImpl struct {
 	pluginSettings       pluginsettings.Service
 	starService          star.Service
 	features             featuremgmt.FeatureToggles
-	openFeature          *featuremgmt.OpenFeatureService
 	dashboardService     dashboards.DashboardService
 	accesscontrolService ac.Service
 	kvStore              kvstore.KVStore
@@ -60,7 +59,7 @@ type NavigationAppConfig struct {
 
 func ProvideService(cfg *setting.Cfg, accessControl ac.AccessControl, pluginStore pluginstore.Store, pluginSettings pluginsettings.Service, starService star.Service,
 	features featuremgmt.FeatureToggles, dashboardService dashboards.DashboardService, accesscontrolService ac.Service, kvStore kvstore.KVStore, apiKeyService apikey.Service,
-	license licensing.Licensing, authnService authn.Service, openFeature *featuremgmt.OpenFeatureService) navtree.Service {
+	license licensing.Licensing, authnService authn.Service) navtree.Service {
 	service := &ServiceImpl{
 		cfg:                  cfg,
 		log:                  log.New("navtree service"),
@@ -70,7 +69,6 @@ func ProvideService(cfg *setting.Cfg, accessControl ac.AccessControl, pluginStor
 		pluginSettings:       pluginSettings,
 		starService:          starService,
 		features:             features,
-		openFeature:          openFeature,
 		dashboardService:     dashboardService,
 		accesscontrolService: accesscontrolService,
 		kvStore:              kvStore,
@@ -189,7 +187,7 @@ func (s *ServiceImpl) GetNavTree(c *contextmodel.ReqContext, prefs *pref.Prefere
 		treeRoot.RemoveSectionByID(navtree.NavIDCfg)
 	}
 
-	enabled := s.openFeature.Client.Boolean(ctx, featuremgmt.FlagPinNavItems, true, openfeature.TransactionContext(ctx))
+	enabled := openfeature.GetApiInstance().GetClient().Boolean(ctx, featuremgmt.FlagPinNavItems, true, openfeature.TransactionContext(ctx))
 	if enabled && c.IsSignedIn {
 		treeRoot.AddSection(&navtree.NavLink{
 			Text:           "Bookmarks",