chore: remove dumplicate clean_separators

[fireairforce]

清理重复的 clean_separators 方法，目前 turbopack 里面没地方消费 turbopack-browser 里面的这个方法

[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 focuses on code cleanup and consolidation by addressing a redundant utility function. It removes an unused clean_separators function from the turbopack-browser crate and promotes the existing clean_separators function in turbopack-core to public visibility. This change ensures a single, authoritative implementation for cleaning separators, improving maintainability and consistency within the Turbopack project.

Highlights

• Code Redundancy Removal: The clean_separators function, which was duplicated and unused within the turbopack-browser crate, has been completely removed to streamline the codebase.
• Function Visibility Update: The clean_separators function in the turbopack-core crate has been updated from a private to a public function, making it accessible for broader use across the project as the canonical implementation.

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[gemini-code-assist]

Code Review

这个 PR 通过移除 turbopack-browser 中一个重复的 clean_separators 函数并公开 turbopack-core 中的版本，来整理代码库。这是一个很好的重构，有助于统一功能实现。

需要注意的是，被移除的函数和保留的函数在实现上存在差异：

• 被移除的函数 (turbopack-browser)：删除字符 /#?@。
• 保留的函数 (turbopack-core)：将 /#?[]<>@ 替换为 _。

根据 PR 的描述，被移除的函数没有被使用，所以这个改动应该是安全的。将这个逻辑集中到 turbopack-core 中是合理的做法。

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turbopack/crates/turbopack-browser/src/chunking_context.rs (947-950)

这个函数的功能与 turbopack-core 中的 clean_separators 函数并不完全相同。此函数移除 /#?@ 字符，而 turbopack-core 中的版本则将更广泛的字符集 (/#?[]<>@) 替换为下划线 _。虽然根据描述此函数已不再使用，但将两者称为“重复”可能会产生误导。在提交信息或代码注释中准确描述这种差异，有助于提高代码的可维护性。