chore: remove Milestone module and update related schemas

- Deleted the MilestoneModule and its associated schema to streamline the codebase.
- Updated QuizSchema to replace scheduleId with serviceId, enhancing the relationship structure.
- Removed references to Milestone in ServiceSchema, improving clarity and focus on relevant entities.
- Updated Prisma types to reflect the removal of Milestone, ensuring data integrity across the application.

src/Quiz/quiz.schema.ts

@@ -20,8 +20,8 @@ export class QuizSchema extends PothosSchema {
     return this.builder.prismaObject('Quiz', {
       fields: (t) => ({
         id: t.exposeID('id'),
-        scheduleId: t.exposeID('scheduleId'),
-        schedule: t.relation('schedule'),
+        serviceId: t.exposeID('serviceId'),
+        service: t.relation('service'),
         quizTitle: t.exposeString('quizTitle'),
         quizSynopsis: t.exposeString('quizSynopsis'),
         progressBarColor: t.exposeString('progressBarColor'),