fix: replace createSubjectData with userID

Author: david-roper

apps/api/src/sessions/dto/create-session.dto.ts

@@ -2,13 +2,12 @@ import { ValidationSchema } from '@douglasneuroinformatics/libnest';
 import { $CreateSessionData } from '@opendatacapture/schemas/session';
 import type { SessionType } from '@opendatacapture/schemas/session';
 import type { CreateSubjectData } from '@opendatacapture/schemas/subject';
-import type { CreateUserData } from '@opendatacapture/schemas/user';
 
 @ValidationSchema($CreateSessionData)
 export class CreateSessionDto {
   date: Date;
   groupId: null | string;
   subjectData: CreateSubjectData;
   type: SessionType;
-  userData: CreateUserData;
+  userId: null | string | undefined;
 }