Add engineer-reviewers to CODEOWNERS

[lesliecdubs]

What are you trying to accomplish?

The primer/design-reviewers group isn't too big, and engineer reviewers are already watching some files in this repo. Let's add primer/engineer-reivewers as a CODEOWNER group too so we can have round robin reviews in this repo and ensure PR review requests don't go stale.

Can these changes ship as is?

• Yes, this PR does not depend on additional changes. 🚢

[changeset-bot]

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Latest commit: 77c2c7b

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[Copilot]

Pull request overview

This PR adds the @primer/engineer-reviewers team to the CODEOWNERS file to enable round-robin review assignments and prevent stale PR review requests. The change ensures that engineer reviewers are included alongside design reviewers for all files in the repository.

• Adds @primer/engineer-reviewers to the wildcard pattern that applies to all files

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