fix(turbopack): downgrade duplicate binding from error to warn

[fireairforce]

https://github.com/swc-project/swc/blob/main/crates/swc_ecma_lints/src/rules/critical_rules.rs#L770

把这个 error 先放宽成 warn，webpack 对这种 case 不会检查。

[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!

This pull request refines how Turbopack processes certain code constructs by reclassifying specific issues. It modifies the system to treat instances of duplicate variable declarations as warnings rather than critical errors. This change is intended to enhance compatibility with existing codebases and development workflows, particularly those that might be less strict about such declarations.

Highlights

• Error Severity Downgrade: The severity of 'duplicate binding' errors has been downgraded from Error to Warning within the Turbopack SWC utility emitter. This change specifically targets messages containing 'defined multiple times'.
• Compatibility Improvement: This adjustment aims to align Turbopack's behavior with Webpack, which does not treat duplicate binding cases as errors, thus potentially reducing build failures for compatible code.

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[gemini-code-assist]

Code Review

你好，感谢你的贡献。这个修改将 SWC 的重复绑定错误降级为警告，以与 Webpack 的行为保持一致。代码实现是直接的，但我发现了一些可以改进的地方以提高代码质量：

1. match 语句中存在编译错误和重复的代码块，可以进行重构以提高可读性和可维护性。
2. 用于检测重复绑定错误的字符串是一个“魔法字符串”，最好将其提取为常量。

我在代码中留下了具体的建议。请查看。