Auth: Add access token to in-proc communication and ServiceIdentity (#98926)

Use fake access token for in-proc grpc and add ServiceIdentity 
---------

Co-authored-by: gamab <gabriel.mabille@grafana.com>
Co-authored-by: Karl Persson <23356117+kalleep@users.noreply.github.com>

pkg/storage/unified/resource/server.go

@@ -20,7 +20,6 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 
 	claims "github.com/grafana/authlib/types"
-	"github.com/grafana/grafana/pkg/apimachinery/identity"
 	"github.com/grafana/grafana/pkg/apimachinery/utils"
 )
 
@@ -233,13 +232,7 @@ func NewResourceServer(opts ResourceServerOptions) (ResourceServer, error) {
 	}
 
 	// Make this cancelable
-	ctx, cancel := context.WithCancel(claims.WithAuthInfo(context.Background(),
-		&identity.StaticRequester{
-			Type:           claims.TypeServiceAccount,
-			Login:          "watcher", // admin user for watch
-			UserID:         1,
-			IsGrafanaAdmin: true,
-		}))
+	ctx, cancel := context.WithCancel(context.Background())
 	s := &server{
 		tracer:      opts.Tracer,
 		log:         logger,