Bug 486106

SUMMARY
When vscode (OSS build from the openSUSE repo) is pinned to taskbar, clicking the icon does not result in it being correctly launched in a new cgroup, instead remaining in `plasma-plasmashell.service`.
This results in `systemctl --user restart plasma-plasmashell` (to fix a hung/misbehaving plasma) causing VSCode to crash.

If VSCode was launched from the start menu or from KRunner, it gets correctly assigned its own cgroup.

STEPS TO REPRODUCE
1. Pin `code.desktop` to taskbar
2. Click the pinned icon to launch vscode
3. `systemctl --user restart plasma-plasmashell`

OBSERVED RESULT
VSCode crashes. 

EXPECTED RESULT
Any apps opened are unaffected.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: openSUSE Tumbleweed 20240423
(available in About System)
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0

ADDITIONAL INFORMATION
Content of `/usr/share/applications/code.desktop`:

[Desktop Entry]
Name=Code - OSS
Comment=Code Editing. Redefined.
GenericName=Text Editor
Exec=code --unity-launch %F
Icon=code-oss
Type=Application
StartupNotify=false
StartupWMClass=Code
Categories=TextEditor;Development;IDE;
MimeType=text/plain;inode/directory;application/x-code-workspace;
Actions=new-empty-window;
Keywords=vscode;

[Desktop Action new-empty-window]
Name=New Empty Window
Name[de]=Neues leeres Fenster
Name[es]=Nueva ventana vacía
Name[fr]=Nouvelle fenêtre vide
Name[it]=Nuova finestra vuota
Name[ja]=新しい空のウィンドウ
Name[ko]=새 빈 창
Name[ru]=Новое пустое окно
Name[zh_CN]=新建空窗口
Name[zh_TW]=開新空視窗
Exec=code --new-window %F
Icon=code-oss