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/plugins/manager/fakes/fakes.go

@@ -162,30 +162,6 @@ func (pc *FakePluginClient) RunStream(_ context.Context, _ *backend.RunStreamReq
 	return backendplugin.ErrMethodNotImplemented
 }
 
-type FakePluginStore struct {
-	Store map[string]plugins.PluginDTO
-}
-
-func NewFakePluginStore() *FakePluginStore {
-	return &FakePluginStore{
-		Store: make(map[string]plugins.PluginDTO),
-	}
-}
-
-func (f *FakePluginStore) Plugin(_ context.Context, id string) (plugins.PluginDTO, bool) {
-	p, exists := f.Store[id]
-	return p, exists
-}
-
-func (f *FakePluginStore) Plugins(_ context.Context, _ ...plugins.Type) []plugins.PluginDTO {
-	var res []plugins.PluginDTO
-	for _, p := range f.Store {
-		res = append(res, p)
-	}
-
-	return res
-}
-
 type FakePluginRegistry struct {
 	Store map[string]*plugins.Plugin
 }