This patch any role that can edit a post, including custom post types, or edit theme options to read global styles from the API. This enables read-only access to global styles in the post editor. Test coverage in included.
Props ramonopoly, peterwilsoncc, mukesh27, aaronrobertshaw, mamaduka, spacedmonkey, talldanwp, timothyblynjacobs.
Fixes#62042.
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