deepin: workflow: disable backup-to-gitlabwh

[Avenger-285714]

With the new Prow-based workflow in place, this is redundant.

Link: deepin-community/.github#92
Link: deepin-community/template-repository#21

Reviewed-by: Gary Wang wangzichong@uniontech.com

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关键摘要:

• 删除的文件 backup-to-gitlab.yml 应该确认是否有替代的配置文件或任务。
• 工作流 backup-to-gitlabwh 的引用使用了 @master 指定了分支，应该确认分支的稳定性。
• 删除工作流后，相关的 secrets 可能不再有效，需要检查是否有其他地方使用这些 secrets。

是否建议立即修改:

• 是，需要确认工作流的删除是否是有意为之，并确保不会影响其他依赖这些工作流的流程。同时，应该检查 secrets 的使用情况，并确保它们在删除工作流后仍然有效。