fix lint

[tanyabouman]

- Summary

Linting fails with an error.

Error: Failed to load parser 'babel-eslint' declared in '.eslintrc.yml': Cannot find module 'babel-eslint'

Solution:

• babel-eslint is now @babel/eslint-parser
• add eslint-plugin-react and turn off PropType checking because those types are not provided
• add eslint-plugin-cypress and add cypress folder to the lint command
• apply fixes and use a few small exceptions

- Test plan

Run yarn lint. Linting succeeds.

- Description for the changelog

fix lint: switch from babel-eslint to @babel/eslint-parser, add react plugin, and fix errors