Add setting to show/hide extended CODECHECK details on article page

Currently the extended CODECHECK details section (check date, summary, repository, manifest files, additional information) is always visible on the article landing page when expanded via "More details".

A journal-level setting should be added to the plugin settings form to allow journal managers to control whether this section is available to readers or not.

**Note:**
This depends on #109 (Settings Form PR) being merged into main first. Implementation should be added to the settings form once that PR is merged.

**Related:** #37, #109