AccessControl: Grant data source reader to all users when running oss (#49514)

* grant data source reader to all users when running oss or enterprise
without license

* fix asserts in alerting tests

* add oss licensing service for test setup

* fix tests to pass in enterprise

* lint

* fix tests

* set setting.IsEnterprise flag for tests

Co-authored-by: Yuriy Tseretyan <yuriy.tseretyan@grafana.com>

pkg/api/common_test.go

@@ -34,6 +34,7 @@ import (
 	dashver "github.com/grafana/grafana/pkg/services/dashboardversion"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/services/ldap"
+	"github.com/grafana/grafana/pkg/services/licensing"
 	"github.com/grafana/grafana/pkg/services/login/loginservice"
 	"github.com/grafana/grafana/pkg/services/login/logintest"
 	"github.com/grafana/grafana/pkg/services/preference/preftest"
@@ -373,6 +374,7 @@ func setupHTTPServerWithCfgDb(t *testing.T, useFakeAccessControl, enableAccessCo
 		QuotaService:       &quota.QuotaService{Cfg: cfg},
 		RouteRegister:      routeRegister,
 		SQLStore:           store,
+		License:            &licensing.OSSLicensingService{},
 		searchUsersService: searchusers.ProvideUsersService(db, filters.ProvideOSSSearchUserFilter()),
 		dashboardService: dashboardservice.ProvideDashboardService(
 			cfg, dashboardsStore, nil, features,