List view should only allow 100 ghost events per recurring event.

Summary: Ref T8394, List view should only allow 100 ghost events per recurring event

Test Plan: Open list view with many recurring events. Shouldn't hang.

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8394

Differential Revision: https://secure.phabricator.com/D13132