fix: stop logging context Canceled as error (#11177)

fixes #11166 and a related log that could have the same problem

enterprise/tailnet/pgcoord.go

@@ -639,7 +639,7 @@ func (m *mapper) run() {
 			m.logger.Debug(m.ctx, "skipping nil node update")
 			continue
 		}
-		if err := m.c.Enqueue(update); err != nil {
+		if err := m.c.Enqueue(update); err != nil && !xerrors.Is(err, context.Canceled) {
 			m.logger.Error(m.ctx, "failed to enqueue node update", slog.Error(err))
 		}
 	}

tailnet/coordinator.go

@@ -810,7 +810,7 @@ func v1RespLoop(ctx context.Context, cancel context.CancelFunc, logger slog.Logg
 			continue
 		}
 		err = q.Enqueue(nodes)
-		if err != nil {
+		if err != nil && !xerrors.Is(err, context.Canceled) {
 			logger.Error(ctx, "v1RespLoop failed to enqueue v1 update", slog.Error(err))
 		}
 	}