Some metrcic names do not follow Prometheus convention

[alexbozhenko]

There are some best practices on how to name the metrics:
https://prometheus.io/docs/practices/naming/

We do not follow them with some of our metrics:
For example, for jetstream_api_requests, should be jetstream_api_request_total.
Grafana complains about this:

When metrics are scraped by otel collectior, it also causes confusion, since otel collector would add the _total suffixes, thus requiring to fix the metric names in the dashboards.

We should fix the metric names to follow Prometheus recommendations, and fix the dashboards.