R1:d92ed9ce0c0c

Hide "Packages" field in Diffusion Commits query form when application uninstalled

Summary: Fixes T15698

Test Plan:
1. Uninstall Packages via `/applications/view/PhabricatorPackagesApplication/`
2. Go to `/diffusion/commit/`, expand the Query form, and see that `Packages` is not shown anymore

Reviewers: O1 Blessed Committers, 20after4

Reviewed By: O1 Blessed Committers, 20after4

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15698

Differential Revision: https://we.