Alerting: enable e2e tests to run in production mode (#45073)

* Alerting: run e2e tests in production mode

* adapt expected messages

* switch expected and actual to have the right order

pkg/tests/testinfra/testinfra.go

@@ -236,6 +236,10 @@ func CreateGrafDir(t *testing.T, opts ...GrafanaOpts) (string, string) {
 			_, err = ngalertingSection.NewKey("alertmanager_config_poll_interval", o.NGAlertAlertmanagerConfigPollInterval.String())
 			require.NoError(t, err)
 		}
+		if o.AppModeProduction {
+			_, err = dfltSect.NewKey("app_mode", "production")
+			require.NoError(t, err)
+		}
 		if o.AnonymousUserRole != "" {
 			_, err = anonSect.NewKey("org_role", string(o.AnonymousUserRole))
 			require.NoError(t, err)
@@ -313,6 +317,7 @@ type GrafanaOpts struct {
 	CatalogAppEnabled                     bool
 	ViewersCanEdit                        bool
 	PluginAdminEnabled                    bool
+	AppModeProduction                     bool
 	DisableLegacyAlerting                 bool
 	EnableUnifiedAlerting                 bool
 	UnifiedAlertingDisabledOrgs           []int64