Allow listing Dashboards through k8s APIs (#98997)

What

This PR changes the dashboard authorizer logic to no longer require
requester to be the super admin user in order to list dashboards using
k8s APIs.

Why

We no longer need this precondition - dashboards should be listable
based on the regular authorizer logic.

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

pkg/registry/apis/dashboard/authorizer.go

@@ -7,7 +7,6 @@ import (
 
 	"github.com/grafana/authlib/claims"
 	"github.com/grafana/grafana/pkg/apimachinery/identity"
-	"github.com/grafana/grafana/pkg/apis/dashboard"
 	"github.com/grafana/grafana/pkg/infra/log"
 	"github.com/grafana/grafana/pkg/services/dashboards"
 	"github.com/grafana/grafana/pkg/services/guardian"
@@ -27,12 +26,6 @@ func GetAuthorizer(dashboardService dashboards.DashboardService, l log.Logger) a
 			}
 
 			if attr.GetName() == "" {
-				// Discourage use of the "list" command for non super admin users
-				if attr.GetVerb() == "list" && attr.GetResource() == dashboard.DashboardResourceInfo.GroupResource().Resource {
-					if !user.GetIsGrafanaAdmin() {
-						return authorizer.DecisionDeny, "list summary objects (or connect as GrafanaAdmin)", err
-					}
-				}
 				return authorizer.DecisionNoOpinion, "", nil
 			}