NavTree: Make it possible to configure where in nav tree plugins live (#55484)

* NewIA: Plugin nav config

* progress

* Progress

* Things are working

* Add monitoring node

* Add alerts and incidents

* added experiment with standalone page

* Refactoring by adding a type for navtree root

* First test working

* More tests

* more tests

* Progress on richer config and sorting

* Sort weight working

* Path config

* Improving logic for not including admin or cfg nodes, making it the last step so that enterprise can add admin nodes without having to worry about the section not existing

* fixed index routes

* removed file

* Fixes

* Fixing tests

* Fixing more tests and adding support for weight config

* Updates

* Remove unused fake

* More fixes

* Minor tweak

* Minor fix

* Can now control position using sortweight even when existing items have no sortweight

* Added tests for frontend standalone page logic

* more tests

* Remove unused fake and fixed lint issue

* Moving reading settings to navtree impl package

* remove nav_id setting prefix

* Remove old test file

* Fix trailing newline

* Fixed bug with adding nil node

* fixing lint issue

* remove some code we have to rethink

* move read settings to PrivideService and switch to util.SplitString

pkg/services/licensing/oss.go

@@ -55,16 +55,15 @@ func ProvideService(cfg *setting.Cfg, hooksService *hooks.HooksService) *OSSLice
 		HooksService: hooksService,
 	}
 	l.HooksService.AddIndexDataHook(func(indexData *dtos.IndexViewData, req *models.ReqContext) {
-		for _, node := range indexData.NavTree {
-			if node.Id == "admin" {
-				node.Children = append(node.Children, &navtree.NavLink{
-					Text: "Stats and license",
-					Id:   "upgrading",
-					Url:  l.LicenseURL(req.IsGrafanaAdmin),
-					Icon: "unlock",
-				})
-			}
+		if adminNode := indexData.NavTree.FindById(navtree.NavIDAdmin); adminNode != nil {
+			adminNode.Children = append(adminNode.Children, &navtree.NavLink{
+				Text: "Stats and license",
+				Id:   "upgrading",
+				Url:  l.LicenseURL(req.IsGrafanaAdmin),
+				Icon: "unlock",
+			})
 		}
 	})
+
 	return l
 }