chore(ci): update reviewers for /.github/ and CODEOWNERS

[morancj]

Summary

CODEOWNERS for GH workflows, CODEOWNERS itself

Rationale

Reduce the chances of PRs to use the medium or large runners racking up our spend

How has this been tested?

Only via the GH verification:

This CODEOWNERS file is valid.

I don't believe we can fully test until it's merged.

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[cprussin]

You may want to change the title of this PR before merging since it's not actually restricting access, just adding automatic reviewers, and someone seeing the message "restrict access" in the commit log may be confused :)

[morancj]

You may want to change the title of this PR before merging since it's not actually restricting access, just adding automatic reviewers, and someone seeing the message "restrict access" in the commit log may be confused :)

doh, sorry, thanks!