fix: ignore babelrc in legacy plugin

[meteorlxy]

Description

This is an additional PR for #2766

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.

[patak-dev]

@underfin given Evan's approval in #2766, I think you could merge this one too without his input

[meteorlxy]

BTW, plugin-react-refresh has not been released after #2766.

Just a reminder for Evan to release plugin-react-refresh and plugin-legacy @yyx990803

[patak-dev]

Thanks @meteorlxy, I'll do the release of both later today 👍🏼