- Add `vendor/bundle` into .gitignore template (#32930)
- Add `vendor/bundle` into .gitignore template (#32930)

Summary:
Ref https://github.com/facebook/react-native/pull/32303#issuecomment-984650053

Recently, Gemfile & .ruby-version have been introduced but local vendor artifacts have not been correctly added into gitignore, see https://github.com/facebook/react-native/pull/32303

## Changelog

<!-- Help reviewers and the release process by writing your own changelog entry. For an example, see:
https://github.com/facebook/react-native/wiki/Changelog
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[General] [Added] - Add `vendor/bundle` into .gitignore template

Pull Request resolved: https://github.com/facebook/react-native/pull/32930

Test Plan: N / A

Reviewed By: cortinico

Differential Revision: D33688116

Pulled By: yungsters

fbshipit-source-id: 787b2b90da1e9f32f0a9e754741affbda443b3e8

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