Healthcheck shouldn't report error on missing status response

[karol-kokoszka]

As per title

scylla-manager/pkg/service/healthcheck/runner.go

Lines 68 to 80 in bff2401

	client, err := r.scyllaClient(ctx, clusterID)
	if err != nil {
	return errors.Wrap(err, "get client")
	}
	status, err := client.Status(ctx)
	if err != nil {
	return errors.Wrap(err, "status")
	}
	live := status.Live()
	r.removeMetricsForMissingHosts(clusterID, live)
	r.checkHosts(ctx, clusterID, live)

Service should save the last live nodes and rely on them if it didn't manage to update this information.