db: squash migrations

supabase/migrations/20241223012712_validate_mark_as_complete.sql

@@ -1,18 +0,0 @@
-set check_function_bodies = off;
-
-CREATE OR REPLACE FUNCTION public.check_if_student_completed_exercises(lesson_id_arg uuid, groupmember_id_arg uuid)
- RETURNS boolean
- LANGUAGE plpgsql
-AS $function$
-DECLARE
-    all_exercises_exist boolean;
-BEGIN
-    SELECT COUNT(*) = COUNT(s.id) INTO all_exercises_exist
-    FROM exercise e
-    LEFT JOIN submission s ON e.id = s.exercise_id AND s.submitted_by = groupmember_id_arg
-    WHERE e.lesson_id = lesson_id_arg;
-
-    RETURN all_exercises_exist;
-END;
-$function$
-;