Remove unnecessary ESLint overrides

[mcmire]

There are a fair amount of overrides in our ESLint configuration file:

• We have some rules we've disabled because they were inconvenient to use at the time. We should correct the usages so that we can remove these overrides.
• We have some we've disabled because they were automatically enabled via an upgrade to our ESLint config packages, and we didn't have time to adjust the code to match. We should make the proper adjustments so that we can remove these overrides.
• We have some rules whose behavior we've modified because it made more sense. We should consider copying these changes into the ESLint config monorepo.