add babel plugins, plugin-syntax-flow & plugin-transform-react-jsx

[tmclo]

Tested to confirm warnings after installing "eslint-config-react-app" with yarn; code successfully runs without warnings prior to these imports, tested to confirm these changes don't break the functionality of the original code and changes have been successful.

This pull request fixes issue #12456

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[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!