[Calendar] Account Calendar should Remove students that are in "Past Enrollments."

Problem statement:

When we had a middle school turn on their account calendar to auto-enroll students and staff that are linked to that sub-account, we received notifcations from students in high school that were receiving items on their calendar from their former middle school. The reason this happens is because we need to keep student data for at least five years so we keep all enrollments "active" but we move them to past enrollments.

Proposed solution:

We would like the ability to enroll students to be auto-subscribed to an account calendar only if they are in an active course in the "current" term.

User role(s):

admin