Authz: add support to use folder api to fetch folder tree (#100038)

* Add FolderStore interface

* Authz: add implementation to use folders api and use it inproc with loopback config

* Add tracing and add rest.Config for talking with folder api using access tokens

* Restructure test to get rid of circular dependencies in tests

* use correct group version kind

---------

Co-authored-by: gamab <gabriel.mabille@grafana.com>

pkg/storage/unified/apistore/util.go

@@ -9,7 +9,6 @@ import (
 	"bytes"
 	"fmt"
 	"strconv"
-	"strings"
 
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -19,7 +18,6 @@ import (
 
 	"github.com/grafana/grafana/pkg/apimachinery/utils"
 
-	grafanaregistry "github.com/grafana/grafana/pkg/apiserver/registry/generic"
 	"github.com/grafana/grafana/pkg/storage/unified/resource"
 )
 
@@ -128,41 +126,3 @@ func isUnchanged(codec runtime.Codec, obj runtime.Object, newObj runtime.Object)
 
 	return bytes.Equal(buf.Bytes(), newBuf.Bytes()), nil
 }
-
-func testKeyParser(val string) (*resource.ResourceKey, error) {
-	k, err := grafanaregistry.ParseKey(val)
-	if err != nil {
-		if strings.HasPrefix(val, "pods/") {
-			parts := strings.Split(val, "/")
-			if len(parts) == 2 {
-				err = nil
-				k = &grafanaregistry.Key{
-					Resource: parts[0], // pods
-					Name:     parts[1],
-				}
-			} else if len(parts) == 3 {
-				err = nil
-				k = &grafanaregistry.Key{
-					Resource:  parts[0], // pods
-					Namespace: parts[1],
-					Name:      parts[2],
-				}
-			}
-		}
-	}
-	if err != nil {
-		return nil, err
-	}
-	if k.Group == "" {
-		k.Group = "example.apiserver.k8s.io"
-	}
-	if k.Resource == "" {
-		return nil, apierrors.NewInternalError(fmt.Errorf("missing resource in request"))
-	}
-	return &resource.ResourceKey{
-		Namespace: k.Namespace,
-		Group:     k.Group,
-		Resource:  k.Resource,
-		Name:      k.Name,
-	}, err
-}