feat: add Omnissa Horizon Client as a maintained app (#30503)

Closes #32558

This PR adds Omnissa Horizon Client as a new maintained app for macOS.
The app is available through homebrew and is used for connecting to
virtual desktops and applications in enterprise environments, enabling
secure remote access for end users.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Added support for the Omnissa Horizon Client application on macOS,
including installation and comprehensive uninstallation procedures.
* The application is now listed among maintained apps with relevant
metadata and management scripts.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Kenny Botelho <kbotelho@nvidia.com>
Co-authored-by: jkatz01 <yehonatankatz@gmail.com>

ee/maintained-apps/inputs/homebrew/omnissa-horizon-client.json

@@ -0,0 +1,7 @@
+{
+  "name": "Omnissa Horizon Client",
+  "slug": "omnissa-horizon-client/darwin",
+  "unique_identifier": "com.omnissa.horizon.client.mac",
+  "token": "omnissa-horizon-client",
+  "installer_format": "dmg"
+} 

ee/maintained-apps/outputs/apps.json

@@ -155,6 +155,13 @@
       "unique_identifier": "notion.id",
       "description": "Notion is an all-in-one workspace for writing, planning, collaborating, and organizing."
     },
+    {
+      "name": "Omnissa Horizon Client",
+      "slug": "omnissa-horizon-client/darwin",
+      "platform": "darwin",
+      "unique_identifier": "com.omnissa.horizon.client.mac",
+      "description": ""
+    },
     {
       "name": "Postman",
       "slug": "postman/darwin",