feat: add admin tests read and update endpoints

src/modules/submissions/entities/submission.entity.ts

@@ -14,24 +14,24 @@ import { SubmissionAnswer } from './submission-answer.entity';
 @Entity()
 export class Submission {
   @PrimaryGeneratedColumn()
-  id: number;
+  id!: number;
 
   @ManyToOne(() => User, { nullable: true, onDelete: 'SET NULL' })
   user?: User;
 
   @ManyToOne(() => Test, { onDelete: 'CASCADE' })
-  test: Test;
+  test!: Test;
 
   @Column({
     type: 'enum',
     enum: SubmissionStatus,
     default: SubmissionStatus.IN_PROGRESS,
   })
-  status: SubmissionStatus;
+  status!: SubmissionStatus;
 
   @OneToMany(() => SubmissionAnswer, (answer) => answer.submission)
-  answers: Array<SubmissionAnswer>;
+  answers!: Array<SubmissionAnswer>;
 
   @CreateDateColumn()
-  createdAt: Date;
+  createdAt!: Date;
 }