fix(GODT-2829): Sync Service fixes

Fix tracking of child jobs. The build stage splits the incoming work
even further, but this was not reflected in the wait group counter. This
also fixes an issue where the cache was cleared to late.

Add more debug info for analysis.

Refactor sync state interface in order to have persistent sync rate.

internal/services/syncservice/handler.go

@@ -117,7 +117,11 @@ func (t *Handler) Execute(
 		}
 
 		t.log.WithField("duration", time.Since(start)).Info("Finished user sync")
-		t.syncFinishedCh <- err
+		select {
+		case <-ctx.Done():
+			return
+		case t.syncFinishedCh <- err:
+		}
 	})
 }
 
@@ -179,8 +183,12 @@ func (t *Handler) run(ctx context.Context,
 		if err := t.syncState.SetMessageCount(ctx, totalMessageCount); err != nil {
 			return fmt.Errorf("failed to store message count: %w", err)
 		}
+
+		syncStatus.TotalMessageCount = totalMessageCount
 	}
 
+	syncReporter.InitializeProgressCounter(ctx, syncStatus.NumSyncedMessages, syncStatus.TotalMessageCount)
+
 	if !syncStatus.HasMessages {
 		t.log.Info("Syncing messages")
 
@@ -198,6 +206,11 @@ func (t *Handler) run(ctx context.Context,
 			t.log,
 		)
 
+		stageContext.metadataFetched = syncStatus.NumSyncedMessages
+		stageContext.totalMessageCount = syncStatus.TotalMessageCount
+
+		defer stageContext.Close()
+
 		t.regulator.Sync(ctx, stageContext)
 
 		// Wait on reply