Separate sync and backup notification types (successes separated from failures)

[FibreTTP]

Describe your suggested feature

I have syncing enabled with Syncyomi, syncing automatically every time the app is opened, a chapter is opened or read, and every thirty minutes. Each time one of these occurs, a notification is shown.

Since a sync has never failed, I don't know if it would appear in a separate notification channel, but I assume it doesn't, given the name of the channel (simply, "Progress"). This means I cannot disable notifications for sync successes, without also being unaware of when a sync fails.

Presumably, this also applies to backups and restores, given that syncs are in the same notification category; I don't want to give up the ability to know when a backup fails in order to disable the constant "Syncing library complete" notification.

To go further, this should then also apply to backup and restores, having backup successes and failures be separate notification channels.

Other details

Related: #1152
Maybe related: #1280

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