Updates the list of assignments on a specified campaign instance that belong to a specified tenant.

List of campaign assignments to modify:
Campaign assignment payload details:

- id: Campaign assignment ID.
- reviewer: Details about the campaign reviewer. Required when redirecting an assignment to another user.
- operation: The operation to be executed.


Allowable values for operation are: approved, rejected, redirected, escalated.
approved: Approve an assignment.
rejected: Reject an assignment.
redirected: Redirect an assignment.
escalated: Escalate an assignment.

- justification: A justification for the action taken on the assignment by the reviewer.
- doImmediateFulfillment: Immediate action on the assignment when signOff is manual and doImmediateFulfillment is set to true.