More ESLint Migration

[taeold]

Turns out I missed most of the files for migration from prettier to eslint in #1194 due to poorly configured .eslintignore - it ignored all files under src/v1 and src/v2!

Correctly configure eslint and run npm run format. Again, I had to manually fixup issues like:

1. Remove empty function definition (prefer ()=>undefined over ()=>{})
2. Remove unused arguments from function definitions

[taeold]

Again, I'm going to merge this PR without waiting for a review. I don't expect a human to be able to review this PR. Instead, we will rely on integration tests and bugbash to help surface any accidental regression.