gateway api: return if run is stopping

internal/services/gateway/api/run.go

@@ -54,6 +54,7 @@ type RunResponse struct {
 	Phase       rstypes.RunPhase  `json:"phase"`
 	Result      rstypes.RunResult `json:"result"`
 	SetupErrors []string          `json:"setup_errors"`
+	Stopping    bool              `json:"stopping"`
 
 	Tasks                map[string]*RunResponseTask `json:"tasks"`
 	TasksWaitingApproval []string                    `json:"tasks_waiting_approval"`
@@ -122,7 +123,9 @@ func createRunResponse(r *rstypes.Run, rc *rstypes.RunConfig) *RunResponse {
 		Annotations: r.Annotations,
 		Phase:       r.Phase,
 		Result:      r.Result,
+		Stopping:    r.Stop,
 		SetupErrors: rc.SetupErrors,
+
 		Tasks:                make(map[string]*RunResponseTask),
 		TasksWaitingApproval: r.TasksWaitingApproval(),