Report the GBT status in the monitoring application

Summary

The front-end optical links monitoring has been removed in !9 (merged) since it was only compatible with v2 electronics. In the v3 electronics all communication with the front-end is done via GBT links which can be monitored. The RPC method retrieving the data already exists, but is not used by the gemmonitor client application.

What is the expected correct behavior?

The GBT link status should be displayed.

Relevant logs and/or screenshots

The GBT link status are not displayed.

(Taken from https://gitlab.cern.ch/cmsgemonline/cmsgemos/-/merge_requests/9#note_3412128)

Use the daqmon::getmonGBTLink RPc method to retrieve the GBT links status are expose the values into the web interface.