fix(db): add groupmember to GROUP BY in getEnrolledCourses

The query selected groupmember.certificate_earned_at as a non-aggregated
column but only grouped by course.id and course_completion_record.id,
causing Postgres error 42803. Add groupmember.id (its PK) to the GROUP BY
so the certificate column is functionally determined.

packages/db/src/queries/course/course.ts

@@ -1011,7 +1011,7 @@ export const getEnrolledCourses = async ({
           or(isNotNull(schema.groupmember.id), isNotNull(schema.programMember.id))
         )
       )
-      .groupBy(schema.course.id, schema.courseCompletionRecord.id)
+      .groupBy(schema.course.id, schema.groupmember.id, schema.courseCompletionRecord.id)
       .orderBy(desc(schema.course.createdAt));
 
     const liveCourseIds = result.filter((row) => row.course.type === 'LIVE_CLASS').map((row) => row.course.id);