Use property initializer syntax in Jest codebase

[SimenB]

From #7844 (comment)

It'd be nice to avoid bind(this) and constructor assignments. We need to add https://babeljs.io/docs/en/babel-plugin-proposal-class-properties and go through the code to figure out where we could use it

Hi @SimenB I'm interested in working in this issue! Where's a good place to start looking for breadcrumbs?

[natealcedo]

@peanutenthusiast If you're using vscode, you can start by using the global search command + shift + f and look for .bind(this). That should get the ball rolling

[SimenB]

You can take a look at #7881 as well

[jeysal]

Note that #8117 didn't change the unnecessary constructor assignments mentioned in the OP, just binds. (Good enough for me though, the binds are what's most annoying)

[SimenB]

It's in now, so we can start using it, and fixing different parts as we come over them

[github-actions]

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