fix: treat watch.ignore correctly

[hyf0]

Description

vite/packages/vite/src/node/server/index.ts

Lines 320 to 322 in eef51cb

	const { ignored = [], ...watchOptions } = serverConfig.watch || {}
	const watcher = chokidar.watch(path.resolve(root), {
	ignored: ['**/node_modules/**', '**/.git/**', ...ignored],

The current codes are only compatible with Array. But it should support something like ignore: /foo/. Details see #4616 (comment).

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• 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.

[hyf0]

move to #4616.