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/api/frontendsettings_test.go

@@ -7,6 +7,7 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/grafana/grafana/pkg/plugins"
 	accesscontrolmock "github.com/grafana/grafana/pkg/services/accesscontrol/mock"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/services/licensing"
@@ -51,7 +52,7 @@ func setupTestEnvironment(t *testing.T, cfg *setting.Cfg, features *featuremgmt.
 		},
 		SQLStore:             sqlStore,
 		SettingsProvider:     setting.ProvideProvider(cfg),
-		pluginStore:          &fakePluginStore{},
+		pluginStore:          &plugins.FakePluginStore{},
 		grafanaUpdateChecker: &updatechecker.GrafanaService{},
 		AccessControl:        accesscontrolmock.New().WithDisabled(),
 		PluginSettings:       pluginSettings.ProvideService(sqlStore, secretsService),