Saved views for repository issues [GA]

### Value Prop

Saved views on the repository Issues page let teams create and share custom views directly within a repository. This makes it easier to manage workflows and makes common sets of issues organized and consistently accessible for everyone, such as items that need to be triaged or high priority bugs.

### Expected Outcome

Teams can align on a standard set of custom views to reduce time spent recreating filters, switching contexts, and managing bookmarks, and makes ongoing triage and prioritization more consistent.

此路线图 issue 描述了 repository Issues 页面所需的已保存视图，但没有指出文件、入口点或测试。首先明确产品范围和实现区域；当团队能够创建、共享并一致地访问自定义 repository issue 视图时，即表示完成。

由索引模型根据 Issue 内容生成。