Add ft Metrics to the Telemetry Metrics list

[benjamin-confino]

https://github.com/OpenLiberty/docs/blob/vNext/modules/ROOT/pages/mptelemetry-metrics-list.adoc does not include ft.metrics so they need to be added.

[dmuelle]

for OL epic: OpenLiberty/open-liberty#27107

[dmuelle]

Hi @benjamin-confino - would you mind doing a quick check of https://docs-draft-openlibertyio.mqj6zf7jocq.us-south.codeengine.appdomain.cloud/docs/latest/mptelemetry-metrics-list.html and if looks ok, add the technical reviewed label to this issue?

Thanks!