Followup on https://issues.redhat.com/browse/NETOBSERV-954

This epic will allow RTT enablement for Docs and QE

Feature gate will be removed (see if needed according to implementation)

Feedback:

• In Overview, Donut: it shows "Ms", which would stand for "Megasecond" ... should be a low-case "ms"
• Overview, Timeseries chart: Y axis should show the unit (ms)
• Overview, Timeseries chart: it seems there's no tooltip?
• Topology, Edge labels: it's also showing Ms instead of ms

On a more general note, I started testing with the default sampling, and this is really impractical as very few RTTs come up. After switching to sampling 1, it started to look good. I guess that's going to be a known issue, at least for some time, but we should probably document that (not only in the downstream doc, but also in the CRD doc). We can create a new task for that in the 1.5 epic.
Also, maybe also in the 1.5 epic, we could add a task to show things like p99 latencies rather than averages, which I think is more relevant to look at for SRE