fix(optimizer): avoid metadata writing race condition

[sun0day]

Description

fix #12836

When vite server receives two page requests in the same time during cold start process, there might be a chance that one request fails to write metadata file since the previous request already renamed the processing cache dir.

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[stackblitz]

Run & review this pull request in StackBlitz Codeflow.

[sun0day]

close this as it's fixed in #12851