Fix an issue with "packages(...)" in typeaheads

Summary:
Fixes T9302. This datasource wasn't resolving package PHIDs correctly for the actual query.

Also fixes an issue with the "Affected packages that need audit" Herald rule.

Test Plan: Ran a "Needs Audit" query with only packages, and only packages(user).

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9302

Differential Revision: https://secure.phabricator.com/D14029