Admin needs to be able to resend Assessor requests

[Rebecca-mcknight1991]

Is your feature request related to a problem? Please describe.
As an admin I need to be able to resend Independent Assessment request emails to Assessors.

Describe the solution you'd like
Issue #319 gives a solution for monitoring returns. It is suggested there would be a way from this table to resent Independent Assessment emails:

1. Either by bulk (tick relevant candidates and send) or
2. Individually by clicking resend

See mock up below (purple buttons)

Describe alternatives you've considered
Notify but it would take too long to resend one by one.

Additional context
Nothing else.

[warrensearle]

The following cloud function should be used for sending a request to assessors:

sendAssessmentReminders

An object containing the following data should be provided as a single parameter:

• exerciseId (required) ID of exercise
• assessmentId (optional) ID of an assessment
• assessmentIds (optional) array of assessment IDs

Example: send a reminder for a specific assessment

sendAssessmentReminders({
  exerciseId: 'exercise123',
  assessmentId: 'assessment56',
})

Example: send assessment reminder for a selection of assessments

sendAssessmentReminders({
  exerciseId: 'exercise123',
  assessmentIds: ['assessment1', 'assessment5', 'assessment56'],
})

Example: send assessment reminders for all assessments in an exercise

sendAssessmentReminders({
  exerciseId: 'exercise123',
})