* Refactor and unify auth plugs for Stats and Sites APIs

* Expose get site Sites API endpoint to all API keys

* Test the new plug

* Add test for endpoint with modified scope

* Fix typos

Co-authored-by: hq1 <hq@mtod.org>

* Rename plug for consistency (h/t @aerosol)

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Co-authored-by: hq1 <hq@mtod.org>