Add %w[] to be the enforced syntax in Rubocop rules

Problem

We see changes requested on MRs and we should add linting rules for these things when they come up so they don't delay or block MR reviews.

Proposal

You can see that a maintainer is looking for consistency around using %w() vs. %w[]. A great way to handle this is to use linting rules. I propose we add this to the official linting rules if this is the case on the gitlab repo.

Result

We'll see less comments on MRs around linting rules that are undefined and contributors will have less specific knowledge to be aware of.

Next steps (if any)

Enjoy not having to think about this.

How will we measure success?

Maybe less delays on MRs?