Fire vttablet_restore_done hook from RestoreFromBackup RPC path (#816)

The vttablet_restore_done hook was only invoked from the RestoreData
(startup) path, but not from the RestoreFromBackup RPC handler. This
meant restores triggered via vtctldclient never fired the hook.

Signed-off-by: Stas Maksimov <smaksimov@slack-corp.com>
Co-authored-by: Claude <svc-devxp-claude@slack-corp.com>

Author: maksimov

go/vt/vttablet/tabletmanager/rpc_backup.go

@@ -197,7 +197,9 @@ func (tm *TabletManager) RestoreFromBackup(ctx context.Context, logger logutil.L
 	l := logutil.NewTeeLogger(logutil.NewConsoleLogger(), logger)
 
 	// Now we can run restore.
-	_, err = tm.restoreDataLocked(ctx, l, 0 /* waitForBackupInterval */, true /* deleteBeforeRestore */, request, mysqlShutdownTimeout)
+	startTime := time.Now()
+	backupEngine, err := tm.restoreDataLocked(ctx, l, 0 /* waitForBackupInterval */, true /* deleteBeforeRestore */, request, mysqlShutdownTimeout)
+	tm.invokeRestoreDoneHook(startTime, err, backupEngine)
 
 	// Re-run health check to be sure to capture any replication delay.
 	tm.QueryServiceControl.BroadcastHealth()