Add an option to use a course full name for forum notifications

Setup Use MailHog or MailCatcher. Set up $CFG->smtphosts on your config.php to point to MailHog's/Catcher's URL (e.g. localhost:1025) Create a course with full name and short name distinct from each other Enrol a student Default settings Log in as an admin Go to Site admin > Plugins > Activity modules > Forum and tick " forum_usecoursefullname " and save changes Open a new browser tab and go to the course Create a new forum activity Expand the Subscriptions and tracking section and confirm " Use course full name in notifications " is ticked by default. Cancel and go back to the course homepage. Back to the settings browser tab, untick " forum_usecoursefullname " and save changes On the course homepage browser tab, create a new forum activity Expand the Subscriptions and tracking section and confirm " Use course full name in notifications " is unticked by default. Display course name Create a forum discussion with forced subscriptions with "Use course full name in notifications" ON. Log in as a teacher and post to the forum. Use the "Advanced" editor and make sure " Send forum post notifications with no editing-time delay " is ticked Run cron. Check the forum email. Confirm that the subject indicates the course's full name. Edit the forum settings and untick "Use course full name in notifications" Reply to the initial post and make sure to send forum notifications without editing time delay. Run cron Check the forum email Confirm that the subject indicates the course's short name. Backup and restore Edit the forum and make sure that "Use course full name in notifications" is ticked. Back up the forum activity. Restore it as a new activity Edit the settings of the restored forum. Confirm that the restore process completes successfully. Confirm that the "Use course full name in notifications" is ticked. Back up a forum from an older version of Moodle (e.g. from 3.11) Restore the old forum backup file to the course. Edit the settings of the restored forum. Confirm that the restore process completes successfully. Confirm that the "Use course full name in notifications" is not ticked.