Delete all repos in a project

As a migrator, I want to quickly delete all repos in a project so that I can re-run a migration

As a devops, I want to delete a repo from PowerShell as part of some other project related automation, for example, to move repos from one project to another and eliminate possibility of committing to the wrong place and not noticing

Notes: easy to commit to different repos, so on the surface not a big deal, but is an issue if there are a large number of repositories and if user is not checking remotes

从仓库现有的 PowerShell 脚本以及 Azure DevOps 项目/仓库操作入手；该 issue 未指定文件、命令入口或测试。定义删除所有仓库或单个仓库时支持的删除范围和安全措施，然后针对迁移或自动化场景验证行为。

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