fix: use NODE_ENV in optimizer

[bluwy]

Description

Use process.env.NODE_ENV too for esbuild define object. Similar to the define plugin:

vite/packages/vite/src/node/plugins/define.ts

Line 15 in eb57627

'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV || config.mode),

Additional context

Found this issue at https://github.com/vitejs/vite/pull/7246/files#r846999746

While optimizing is for dev only, if we set mode to something else, it could affect define process.env.NODE_ENV which doesn't seem right to me.

---

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 Commit 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.