macOS: Clipboard sharing in macOS host and guest stop working, spice-vdagentd issue.

**Describe the issue**
Clipboard sharing in macOS host and guest stop working after some period of time (minutes of inactivity as it seems).
This seems to be caused by spice-vdagentd - killing both spice-vdagent and spice-vdagentd resolves the issue and clipboard sharing starts working again until next time.
I use this command to kill:
`sudo killall -m 'spice-vdagent?'`
It causes automatic restart of both processes - restarting any of the processes alone is not enough apparently.

**Configuration**
* UTM Version: 4.6.4
* macOS Version: 15.2
* Mac Chip (Intel, M1, ...): M1