[ th/drop-monitor-connection-files] settings: drop deprecated NetworkManager.conf option "main.monitor-connection-files"
It's deprecated and off by default for a long time.
It is bad to automatically reload connection profiles. For example, ifcfg files may consist of multiple files, there is no guarantee that we pick up the connection when it's fully written.
Just don't do this anymore.
Users should use D-Bus API or
nmcli connection reload or
nmcli connection load $FILENAME to reload profiles from disk.
A change in behaviour, obviously.