fix(turbopack): set tsconfig not extends as warning not error

[fireairforce]

修复:

把这个当作 warning 抛出来而不是 error。

[gemini-code-assist]

Summary of Changes

Hello @fireairforce, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在优化 Turbopack 处理 tsconfig 配置中 extends 字段解析失败的方式。之前，此类问题会导致构建中断并抛出错误。通过此更改，系统将改为发出警告，从而允许构建继续进行，同时仍能提醒开发者潜在的配置问题，提高了构建过程的容错性。

Highlights

• tsconfig extends 错误处理: 将 tsconfig 中 extends 字段解析失败时的严重性从错误 (Error) 级别降级为警告 (Warning) 级别。

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[gemini-code-assist]

Code Review

这个 PR 将 tsconfig.json 中 extends 字段无法解析时的问题级别从 Error 降级为 Warning。这是一个合理的改动，可以避免在某些情况下（例如，可选的配置文件不存在时）构建意外失败，从而提升了用户体验。代码变更简单明了，与 PR 的目标一致。