Check lint in ci

[kmannislands]

• Change default of eslint script to just check, not fix
  • Add eslint:fix script to auto-fix
• Add eslint check step to GitHub actions
  • Explicitly specify yarn run to invoke package.json scripts.
• Run autofix on existing lint (prettier) violations on master
• Disable eslint on an import from react native where it is failing on master

[codesandbox-ci]

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