Upgrade most dev dependencies

[mourner]

This PR upgrades most dev dependencies to their latest versions (with a few exceptions that are difficult to upgrade such as Flow). A few highlights:

• The old babel-eslint was replaced with @babel/eslint-parser, which required some config changes, including using "@babel/preset-flow" explicitly.
• Babelify was removed from build-tape.js because test-query/test-render appear to no longer need it. It was added in Upgrade direct dependencies & do yarn upgrade #9466 (comment)
• suite_implementation.js was removed as an accidental leftover from some merge conflict resolutions.
• ESLint upgrades required a few minor changes. Generally we need to revisit the // temporarily disabled for easier upgrading of dependencies rules soon because that "temporary" is there for years now.