feat(pipeline-tasks): 强制停止任务接口。

src/pipeline-tasks/pipeline-tasks.resolver.ts

@@ -55,5 +55,7 @@ export class PipelineTasksResolver {
   @Mutation(() => Boolean)
   async stopPipelineTask(@Args('id') id: string) {
     const task = await this.service.findTaskById(id);
+    await this.service.stopTask(task);
+    return true;
   }
 }