Plasma NM's KDED is loaded on boot, but effectively does nothing until
the relevant plasmoid triggers the KDED.
This makes some sense for notifications and monitors, as it allows a
user to opt of a UI plasma network manager experience.
However, we want the secret agent as early in the boot as possible.
If a user is running NM, they definitely want this component active, and
if NM isn't running then registering the agent will no-op anyway.
DBus logs show that with this patch, I am retrieving my password and
a full 1500ms before org.kde.plasmanetworkmanagement.init is called and my initial wifi
connected 3s faster than before this patch.
We could potentially move this kded to phase 0 and get us even earlier.