Access to Moodle Workplace features (not to be confused with Google Workspace), is the reason why you pay a Moodle Partner to provide you with Moodle Workplace instead of using Moodle LMS.
However, over time, Moodle has committed to bringing many of the features that first appear in Moodle Workplace into the Moodle LMS, so this particular feature may be transferred at some point in the future.
Until then, you may be able to use https://moodle.org/plugins/availability_othercompleted to restrict access to an instance of https://moodle.org/plugins/mod_customcert on a course until the relevant other courses have been completed. Disclaimer: I've never used the first of these plugins, so I've no idea how well it works.