Update lint:eslint to not hardcode "."

What does this MR do?

As a developer, I'm much more interested in running eslint against a subset of files rather than all files. Currently there is no easy way to do this in our package.json scripts. Let's repurpose the lint:eslint job to not include a specific directory so the developer can control this.

This MR also:

• Updates the previous references to yarn run lint:eslint to yarn run lint:eslint:all
• Updates the previous references to yarn run internal:eslint to yarn run lint:eslint

Screenshots (strongly suggested)

Look how fast and easy it is now! 🎉

Previously, this takes a really long time because the lint:eslint job is coupled to running the entire project directory.