Fix type definitions for basically all React components

[gsidebo]

Most/all of our React components follow a definition anti-pattern that we repeated in several of our projects before someone finally noticed it. It looks something like this: export class MyPage extends React.Component<*, void>. That React.Component<*, void> basically ignores any type definitions and tells the type checker to accept props of any sort. This may be time-consuming as I noticed several components with clearly incorrect type definitions