Add more BackupManagerMonitor events to PerformUnifiedRestoreTask.

In particular
add events to cover
-If this is KV or Full restore
-For each package, when the restore started and when it ended
-When a restore operation starts, if it is system restore or restore at install
-Any errors

Test: manual testing. Run `adb shell bmgr restore 1` and verify that the
new restore events are added to the dumpsys
atest CtsBackupHostTestCases, GtsBackupHostTestCases
atest BackupManagerMonitorDumpsysUtilsTest,
BackupManagerMonitorEventSenderTest, UserBackupManagerServiceTest,
PerformUnifiedRestoreTaskTest, BmgrTest
Bug: 290747920

Change-Id: I0d221f10932fea3e8fb90a1827c7f1b5bf21d25d