Don't depend on airbnb eslint rules

[Tyriar]

I see this was added in #13142, but it makes finding where rules are and overriding them more little difficult than they need to be. I propose inlining whatever rules you care about into our .eslintrc. An example of this is I wanted to change no-inner-declarations to warn instead of error (as it's a lint warning, not an error when running the extension), and had trouble finding the rule source.

[eleanorjboyd]

@karthiknadig do we want to just bulk copy over the airbnb rules or take a harder look at what our eslint rules are?

[karthiknadig]

We want to take a deeper look at the linter rules, we also want to apply them across all the repos.