feat(agent): auto launch desktop app on install

[thenextman]

The installer registers the Agent desktop companion app to launch at login for all users.

This PR automatically launches the app in the current user session at install time, so they don't need to log out and back in to see it.

Other logged in users will need to log out. This feels like a good compromise versus launching the application in all user sessions (much more complex).

No action is taken on silent installs. This is only for full or basic UI.

[github-actions]

Let maintainers know that an action is required on their side

• Add the label release-required Please cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module) when you request a maintainer to cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module)

• Add the label release-blocker Follow-up is required before cutting a new release if a follow-up is required before cutting a new release

• Add the label publish-required Please publish libraries (`Devolutions.Gateway.Utils`, OpenAPI clients, etc) when you request a maintainer to publish libraries (Devolutions.Gateway.Utils, OpenAPI clients, etc.)

• Add the label publish-blocker Follow-up is required before publishing libraries if a follow-up is required before publishing libraries

[Copilot]

Pull request overview

This PR updates the Windows Agent MSI (WixSharp) to automatically launch the Desktop companion app for the currently installing user immediately after a non-silent first-time install, avoiding the need to log out/in to get the tray app running.

Changes:

• Introduces a shared constant for the Desktop subfolder name (desktop) in installer resources.
• Schedules a new custom action to launch DevolutionsDesktopAgent.exe after InstallFinalize for interactive installs only.
• Updates the installer directory layout definition to use the new desktop directory constant.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
package/AgentWindowsManaged/Resources/Includes.cs	Adds a constant for the Desktop subdirectory name.
package/AgentWindowsManaged/Program.cs	Uses the new Desktop directory constant in the install tree definition.
package/AgentWindowsManaged/Actions/CustomActions.cs	Adds LaunchDesktopApp custom action to start the Desktop app post-install.
package/AgentWindowsManaged/Actions/AgentActions.cs	Schedules LaunchDesktopApp after InstallFinalize for interactive first installs.

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