Update registration with team information

[Drakodin]

Registration has a different team schema from team formation and thus different information must be pushed for updating. Registration's schema is:

{
    teamId: Object.id
    teamLeader: IUser
    members: IUser[]
    teamName: string
}

Requirement - Update the registration endpoint for the team and user schemas. Due to the differing schema, update with the following information: Team ObjectId, team creator, members list, and team name.