[⭐] Added support to control whether test results are saved at the end of training.

[zezhishao]

Description of the new feature / enhancement | 您所需的新功能或能力

Saving test results at the end of training can consume significant disk space. Therefore, BasicTS should provide an option to allow users to decide whether to save these results.

Scenario when this would be used? | 使用场景

Disk space is limited.

Supporting information | 附加信息

NA