Update the synthetic testing data

[richford]

• Add synthetic Clever data at `/users/{userId}/externalData/clever/

{
    ...arbitraryMetadata,
}

• For the synthetic admin users, add users under their control according to

/users/{adminUserId}/adminData/users/ {
    userId1234: true,
    userId2758: true,
}

• Add administrationsStarted to user data for the students.
• Confirm that rewardShown is in the synthetic data for each assessment and that in general, the "local" administration data matches that in https://github.com/yeatmanlab/roar-firebase-functions/issues/19