Improve prometheus scraping metrics docs including Operator

Georgi N. Georgiev | GitLabrequested to merge
ggeorgiev/documentation-operator-metrics into main

What does this MR do?

Adds and improves docs around prometheus metrics.

Adds info how to scrape, relabel and configure metrics in kubernetes and outside.

What are the relevant issue numbers?

Closes Expose runner names in Prometheus metrics (#26660 - closed) • Georgi N. Georgiev | GitLab • 18.2 Closes [K8S Dogfooding] Document how to expose and sca... (#38695 - closed) • Georgi N. Georgiev | GitLab • 18.2

Edited by Georgi N. Georgiev | GitLab

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