upgrades: Add notifications for dist upgrade started or free space warning
- Notify when dist upgrade is started.
- Notify if dist upgrade did not start due to lack of free space.
-
start-dist-upgrade
command prints JSON results. - Use logger for cases that don't need notifications.
Tests:
- Checked each notification appears.
- Notification does not appear again after being dismissed.
We might consider adding a notification when dist upgrade is complete, or just have a constant notification while in progress.