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/setting/setting.go

@@ -226,12 +226,13 @@ type Cfg struct {
 	Packaging string
 
 	// Paths
-	HomePath           string
-	ProvisioningPath   string
-	DataPath           string
-	LogsPath           string
-	PluginsPath        string
-	BundledPluginsPath string
+	HomePath              string
+	ProvisioningPath      string
+	DataPath              string
+	LogsPath              string
+	PluginsPath           string
+	BundledPluginsPath    string
+	EnterpriseLicensePath string
 
 	// SMTP email settings
 	Smtp SmtpSettings
@@ -263,7 +264,9 @@ type Cfg struct {
 	CSPTemplate           string
 	AngularSupportEnabled bool
 
-	TempDataLifetime                 time.Duration
+	TempDataLifetime time.Duration
+
+	// Plugins
 	PluginsEnableAlpha               bool
 	PluginsAppsSkipVerifyTLS         bool
 	PluginSettings                   PluginSettings
@@ -272,8 +275,9 @@ type Cfg struct {
 	PluginCatalogHiddenPlugins       []string
 	PluginAdminEnabled               bool
 	PluginAdminExternalManageEnabled bool
-	DisableSanitizeHtml              bool
-	EnterpriseLicensePath            string
+
+	// Panels
+	DisableSanitizeHtml bool
 
 	// Metrics
 	MetricsEndpointEnabled           bool