Add option for club applications to require graduation year

[julianweng]

Currently, as Penn Clubs does not require users to self-identify their graduation year, many club applications collect the information either through a separate question on the application or elsewhere in the process. This would add the option for clubs to mandate that people fill out their school year on the Penn Clubs platform before being able to submit their application.

This would benefit clubs, as there are less points for error (e.g. clubs forgetting to update their grad year question for new years) and reduces work for them. This would also benefit Clubs (and other clubs) as more users would be nudged to fill out their school year and increasing data availability for other applications.

There could be edge privacy cases where users would not want to expose their graduation year to other clubs or via their profile, but the former would seem rare (and impossible in practice for any club that would care about grad year) and the latter can be solved through hiding their profile. Open to discussion on this point, however.