task_agent_client get_environment_deployment_execution_records does not return a continuation token

The get_environment_deployment_execution_records method in the task_agent_client will accept a continuation token as a parameter but does not return one when called. This means it is not possible to correctly page through the results.

I note that a similar issue for the get_builds method in the build_client was fixed here https://github.com/microsoft/azure-devops-python-api/issues/152. Hopefully it's a case of adding something similar this https://github.com/microsoft/azure-devops-python-api/blob/dev/azure-devops/azure/devops/v5_1/build/build_client.py#L450

从 task_agent_client 中的 get_environment_deployment_execution_records 开始，将其响应处理方式与 build_client.py 第 450 行附近的 get_builds 进行比较，同时参考 issue 152 中提到的修复。确认 API 响应中如何表示 continuation token，并确保该方法返回它，以便调用方可以对结果进行分页。