show tracing tab

Created by: zackzhangkai

Now, if we enabled servicemesh plugin, the logging pods are already. So we should show the tracing tab by default.

# k get po -n kubesphere-logging-system
NAME                                                              READY   STATUS      RESTARTS   AGE
elasticsearch-logging-curator-elasticsearch-curator-161798zzfg8   0/1     Completed   0          2d14h
elasticsearch-logging-curator-elasticsearch-curator-161807dd8qc   0/1     Completed   0          38h
elasticsearch-logging-curator-elasticsearch-curator-161816t9dsj   0/1     Completed   0          14h
elasticsearch-logging-data-0                                      1/1     Running     1          17d
elasticsearch-logging-data-1                                      1/1     Running     1          17d
elasticsearch-logging-discovery-0                                 1/1     Running     1          17d

/assign @leoendless /area microservice /area console