Disambiguate process names

### Problem

Many applications result in several processes which are all shown with the same name and icon in the process list. There is no additional information that distinguishes then in the sidepanel.

For example System Settings has three processes corresponding to `io.elementary.settings`, `io.elementary.settings-daemon` and `io.elementary.settings-daemon.xdg-desktop-portal`. All three are displayed as "System Settings".

### Proposal

The name of the corresponding executable should be displayed. Either as an additional column or in the side pane.

### Prior Art (Optional)

Gnome System Monitor.