desktop: refactor launchers, fix app icons in dock, alt-tab

[kajusnau]

Description of Changes

1. Refactor custom app launchers config:
   • Moved the repeating application type to global type ghafApplication
   • Added several new options to ghafApplication, closely matching DesktopEntry fields
   • Adjusted most existing launchers so the name matches the runtime app-id
     This allows for most DE tools to find the corresponding desktop entry for the given app-id, and therefore allows proper icon and name resolution.
   • Added desktop entry categories for some launchers. As a side-effect, a lot of previously uncatagorized apps will now be categorized (e.g. Office apps like MS365 and Teams will be in the "Office" category in the App Library)
2. Adjusted ghaf-open to work with new desktop entries:
   • ghaf-open helper will now look for desktop entries based on the following order:
     • Name= field value matches provided value
     • filename basename matches the provided value

NOTES:

• Workspaces tool (top left) still does not find the correct app icons. To be investigated separately.
• VPN app will not display the correct icon

Type of Change

• New Feature
• Bug Fix
• Improvement / Refactor

Related Issues / Tickets

Checklist

• Clear summary in PR description
• Detailed and meaningful commit message(s)
• Commits are logically organized and squashed if appropriate
• Contribution guidelines followed
• Ghaf documentation updated with the commit - https://tiiuae.github.io/ghaf/
• Author has run make-checks and it passes
• All automatic GitHub Action checks pass - see actions
• Author has added reviewers and removed PR draft status

Testing Instructions

Applicable Targets

• Orin AGX aarch64
• Orin NX aarch64
• Lenovo X1 x86_64
• Dell Latitude x86_64
• System 76 x86_64

Installation Method

• Requires full re-installation
• Can be updated with nixos-rebuild ... switch
• Other:

Test Steps To Verify:

1. Open some virtual, some non-virtual apps
2. Verify apps open without issues
3. Verify app icons and names show up properly in the Dock and while Alt-Tabbing
4. (Optional) Verify ghaf-open functionality

[milva-unikie]

jenkins-pre-merge has some failures caused by app process name changes. I will fix those in tests after the release testing is done.

[kajusnau]

Rebased on top of refactor, with some minor additional changes.
Should be good to go now.

[milva-unikie]

Tested on Darter Pro (new image)

• Icons work very nicely in the Dock and with Alt+Tab. This PR improves usability significantly. Thank you!
• I disagree with some of the app categories, but we can discuss that separately. In any case, users can change the categories if they want.
• The test automation changes are ready and need to be merged along with this @brianmcgillion.

[milva-unikie]

Verified that everything is still working on Darter Pro after refactoring.

All jenkins-pre-merge runs are currently failing due to signing issues, we will have to wait for the signing to be fixed before rerunning them.

Reminder to @brianmcgillion: I need to merge test automation changes with this.