R1:821708414eec

Allow to uninstall (hide) Audit application

Summary:
While many Phorge applications can be uninstalled (such as Differential for pre-merge commit review), this has not been the case for Audit (post-merge commit review) since rP11861265fe94fa97e4d0563c5bdb7b8cac27282d.

In installations which do not use Audit in their workflows, exposing Audit related UI elements creates additional clutter and complexity.

Fixes T15129

Test Plan:
* Go to `/applications/view/PhabricatorAuditApplication/` and click…