[eslint-config-react-app] accessible-emoji rule has been deprecated

Created by: ljosberinn

Describe the bug

eslint-plugin-jsx-a11y/accessible-emoji rule has been deprecated due to improved browser support. Please consider removing it too, I'll be happy to file a PR.

See https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/pull/713 & https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/issues/627 for further info.