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/Graphql/graphql.module.ts

@@ -14,7 +14,6 @@ import { GraphQLModule } from '@nestjs/graphql'
 import { GraphqlService } from './graphql.service'
 import { ManagedServiceModule } from '../ManagedService/managedservice.module'
 import { MessageModule } from '../Message/message.module'
-import { MilestoneModule } from '../Milestone/milestone.module'
 import { OrderModule } from '../Order/order.module'
 import { PaymentModule } from '../Payment/payment.module'
 import { PothosApolloDriver } from '@smatch-corp/nestjs-pothos-apollo-driver'
@@ -72,7 +71,6 @@ import { PubSubService } from '../PubSub/pubsub.service'
     ServiceAndCategoryModule,
     CategoryModule,
     ServiceFeedbackModule,
-    MilestoneModule,
     ScheduleModule,
     MessageModule,
     CollaborationSessionModule,