Add Invocation method to telemetry #6539
Description
In Instance metrics, we need to add the new-ish server invocation metric:
| Invocation | How the server was started |
Discussion in:
https://influxdata.slack.com/archives/C06BQA608J3/p1763148884570699?thread_ts=1763148294.800249&cid=C06BQA608J3