fix(plugin-legacy): fix to use the browserslist configuration (fix #2476)

[erm1116]

Description

fix #2476

This PR is from closed PR #2627.
When no targets options with @vite/legacy-plugin and if exists "the field of browserslist in package.json" or ".browserslistrc", use it as @babel/preset-env targets.

Additional context

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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.

[naifen00]

When to fix it?

[erm1116]

@naifen00
Maybe, I think CI failing is not my problem... (other PR also fail some checks)
so I don't have any idea to fix this.

@Niputi
could you help me?
And have you made any progress on this PR?

[sapphi-red]

Closing as #11318 was merged.