refactor: comment out user validation in CollaborationSessionSchema and error handling in DateTimeUtils

- Temporarily disable the check for user participation in collaboration sessions to allow for further review of session management logic.
- Comment out the error handling for invalid date times in DateTimeUtils, simplifying the date conversion process for now.
- These changes aim to enhance code maintainability while preserving existing functionality.

src/CollaborationSession/collaborationsession.schema.ts

@@ -99,6 +99,8 @@ export class CollaborationSessionSchema extends PothosSchema {
             //     },
             //   })
             // }
+            // check if user is participant
+            if (!collaborationSession.collaboratorsIds.includes(ctx.http.me.id)) throw new Error('User not allowed')
             return collaborationSession
           }
           /* ---------- use case 2 : center mentor get collaboration session by schedule date id --------- */