R1:c2411e3dcc9c

When viewing a Calendar import, show all the events it imported

Summary: Ref T10747. Show which events a source imported, and link to the full list as a query result.

Test Plan: {F1870049}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10747

Differential Revision: https://secure.phabricator.com/D16703